54 items are filed under this topic.
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The substitution method |
2020-06-10 |
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From Hardebolar:
simultaneous equation by substitution method
.a-b=2/3
a+b=1 2/3
Answered by p. |
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Integration of dx/(x^2+1)^3 |
2016-01-07 |
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From Ishank:
Integration of dx/(x^2+1)^3
Answered by Penny Nom. |
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A linear system |
2014-10-14 |
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From pheter:
4/x - 1/y = 3 .... equation (1)
6/x - 2/y = 5 .... equation (2)
Answered by Penny Nom. |
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Evaluate x-(3x+5) if x=-2 |
2014-04-03 |
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From Destiny:
I wanted to know the value of x-(3x+5) if x=-2
Answered by Penny Nom. |
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f(x)= a+b*lnx |
2013-12-04 |
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From Kevin:
How do I find the curve, algebraically on paper, for f(x)= a+b*lnx with data points
(6,1303) (9,1639). I can do it with LnReg on a calculator but I want to know how
to get the same results or close to the same results by working it out on paper.
When I run it through the LnReg on the calculator I get, f(x)=181.792+828.678 Ln x.
How did it achieve this solution?
Answered by Penny Nom. |
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Substitution type simultaneous equations |
2013-11-03 |
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From Kayla:
I am having problems with substitution type simultaneous equations, when the variable you are substituting is a algebraic one:
y=x^2-3x+4 and 3x-2y=1
I have rearranged 3x-2y=1 to get x=(1+2y)/3 but when I substitute this x value into the other equation, I get the wrong answers!
Would appreciate any help! Thank you.
Answered by Penny Nom. |
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Integral 1/(25-x^2)^3/2 |
2012-02-22 |
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From John:
Integral 1/(25-x^2)^3/2
Answered by Harley Weston. |
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Elimination and substitution |
2010-09-18 |
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From Lauren:
Solve one using the method of substitution and the other with the method of elimination.
v
a. y=5x+4
x=2y+1
b. 4x+3y=7
6x-3y=13
Answered by Penny Nom. |
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y = kx |
2010-03-26 |
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From harold:
if y =kx and y =4/15 and x=2/3, what is value of k
Answered by Penny Nom. |
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The integral of X^3/the square root of 1-x^2 dx |
2010-03-07 |
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From William:
The integral of X^3/the square root of 1-x^2 dx.
Answered by Harley Weston. |
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Substitution method |
2010-02-17 |
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From Melodie:
7x - 4y = -10
4y= x-2
Answered by Tyler Wood. |
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Substitution |
2010-02-14 |
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From Izayah:
what is 3 ways to find the meeting point of y=2x+4 and 3x+y=7
by making 2 table and using a graph
Answered by Stephen La Rocque. |
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An integral |
2010-01-29 |
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From amr:
find the value of the following integral:-
(1+x)power (-1/2) dx
Answered by Robert Dawson. |
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The method of substitution |
2009-09-17 |
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From laura:
ok! i really need help with this question plz help!!
x= - 4y +5
x+2y = 7
Answered by Penny Nom. |
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Substitution in a quadratic |
2009-03-09 |
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From Kieran:
How could I work this out please
f(x)= 3xsquared - 4x + 2
if f(2x)
Answered by Penny Nom. |
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Linear systems |
2009-02-20 |
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From Rose:
I have been having trouble trying to figure out these three math problems , I need help breaking them down so I could understand them better please help.
1. x = 7 - x
2 x - y + 8
2. 8 x + 5 y = 1 8 4
x - y = 3
3. y + 2 x = 3
y + 2 x = 4
I can't figure out how to break them down in the right order.
Answered by Penny Nom. |
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The substitution method |
2009-02-18 |
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From Nicolette:
I am working on linear programming problems that I need to solve pairs of linear equations for. I am confused and am not sure how to solve these problems!
5x+3y=7 y=x-3 How can i solve this using the substitution method?
Answered by Penny Nom. |
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A definite integral |
2009-02-09 |
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From Mathata:
Evaluate: integral from 0 to 1, x^2 e^x^3dx
Answered by Harley Weston. |
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The substitution method |
2009-02-06 |
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From amber:
Pleasse help me with this problem
x+y=-2
y-2x=1
Answered by Penny Nom. |
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The integral of f(x)dx and the integral of f(x-4)dx |
2009-01-02 |
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From Katie:
Calculus:
If the definite integral from -2 to 6 of f(x)dx=10 and the definite integral from 2 to 6 of f(x)dx=3, then the definite integral from 2 to 6 of f(x-4)dx= ?
I don't understand how to solve definite integrals when the function has something more than just x inside the parenthesis such as f(4-x).
Answered by Robert Dawson. |
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The substitution method |
2008-07-26 |
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From Enid:
Solve by substitution method
3x + 7y = 25
-7x + y = 63
Answered by Penny Nom. |
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A rectangular room |
2008-06-30 |
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From Peter:
A rectangular room has a perimeter of 42 feet and an area of 108 square feet. What is the length, in feet, of the shorter side?
Answered by Penny Nom. |
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Substitution into a formula |
2008-06-02 |
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From beth:
Given q(x) = 7xsquared + 9, find q(-7)
These were the choices I had for the answers to this problem
1.) 343
2.) -40
3.) 334
4.) -89
5.) 352
Answered by Penny Nom. |
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Substitution method |
2008-05-30 |
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From taquicia:
2y-x=3
x=5+y
Answered by Janice Cotcher. |
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Integrate 2x(x^2-1)^5 dx |
2008-04-17 |
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From joey:
pls help me to integrate
2x(x^2-1)^5 dx using the substitution u=x^2-1
Answered by Harley Weston. |
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The integral of dx / (4x^2 - 25)^3/2 |
2008-04-01 |
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From Meghan:
I have a question from the trigonometric substitution of my calculus course.
integral of dx / (4x^2 - 25)^3/2
Answered by Harley Weston. |
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An integral |
2008-01-24 |
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From Meghan:
Evaluate the indefinite integral of (x^3 +1)^(1/3) * x^5 * dx.
Answered by Brennan Yaremko. |
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Substitution method |
2007-10-11 |
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From Kevin:
3xx+2y=-36-y=11
Answered by Stephen La Rocque. |
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Two equations in two unknowns |
2007-09-22 |
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From Mary:
Having problems doing this problem, looking for a solution with the work. I would like to see how you got your answer, to see what I was doing wrong.
solve using the substitution method, is there "no solution" or "infinitely many solutions"
4x+y=4
2x+8y=0
Answered by Stephen La Rocque and Leeanne Boehm. |
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Solve by substitution |
2007-07-28 |
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From Marina:
I am stuck with this substition please help.
-3x+y=1
5x+2y=-4
Answered by Penny Nom. |
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The substitution method |
2007-06-23 |
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From mary:
solve the system by the method of substitution:
-5x+2y=-15
4x-y=9
Answered by Stephen La Rocque. |
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The substitution method |
2007-05-08 |
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From A student:
I need help on these two problems( substitution method)
-2x+7y=10
x-3y= -3
and
6x-8y= -12
-3x+4y=9
Answered by Penny Nom. |
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Solve for x and y |
2007-03-27 |
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From anthony:
solve y=4x and x+y=5
Answered by Sara Ulmer. |
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Simultaneous equations with fractions |
2007-02-28 |
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From Alyca:
Hello Math Central, I am a grade 10 student taking Academic math. Our unit right now is method of substitution and elimination. I'm stuck on this one question that I've been doing forever. Please help =)
*For this equation I have to do method of elimination, but it's so much harder with fractions...could some one please explain to me how to do it step by step?*
x y 2
-- - -- = - --
3 6 3
x y 1
-- - -- = 1---
12 4 2
Answered by Steve La Rocque and Ashley Mang. |
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The substitution method |
2007-01-31 |
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From Victoria:
how do i solve this problem using the substitution method?
2x-5= -14
-7x+14y= -5
Answered by Stephen La Rocque. |
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The substitution method |
2005-06-28 |
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From Addie:
how do i know where to began the substitution method? how do i solve
y = x + 1
2x - y = 1
Answered by Penny Nom. |
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The substitution method |
2004-11-28 |
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From A student:
I Was working and i ran into this problem can you help me solve it using the substitution method?
-3x-2y=-10
x+5y=-27
Answered by Penny Nom. |
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The method of substitution |
2004-09-20 |
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From Kayla:
y=x-1
y=2x-3
Answered by Harley Weston. |
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x^2/3 - 7 x^1/3 + 12 = 0 |
2004-04-05 |
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From Jackie:
I am having trouble solving this question for x:
1.) x^2/3 - 7 x^1/3 + 12 = 0
Answered by Penny Nom. |
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The substitution method |
2004-02-14 |
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From Keisha:
I need to solve this problem by using the substitution method.
3x+y=1
x=2y+5
Please help me understand the method to solve.
Answered by Penny Nom. |
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Systems of equations |
2003-11-19 |
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From Scott:
I hope that u can help me....I
am a college student taking a class in Pre Calculus.....I have homework
due this Friday and it counts a BIG Percentage on my FINAL grade.....I
am getting mixed up and can not figure out a few problems.....Please help
me.....
Method Of Subsitution
Problem 1. y- 8x = -5
x(squared) + y(squared) = 25
Problem 2. y = x(squared) - 2x - 6
Y = x(squared) - 4
Answered by Penny Nom. |
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5x - y |
2003-10-11 |
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From Candace:
math problem 5x-y for x=12 and y=14 do you mulitilpy 5x12 and than -the answer from 14 which gives you 46? is this right
Answered by Penny Nom. |
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Substitution method |
2003-09-14 |
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From John:
Hello, my name is john and while I was finishing up my work I stumbled into these problems. a/4-b=-1
a+b=11
and
6a-b=-5
4a-3b=-8 Thanks a lot. I really need some help :)
John
Answered by Penny Nom. |
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Two equations |
2003-08-21 |
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From Jennifer:
The following problems have me stuck and any help would be greatly appreciated seeing my text book is doing me no favours:
32a+1 - 28 3a + 9=0
and
52m - 5m=20
Answered by Penny Nom. |
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The substitution method |
2003-04-14 |
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From Patty:
I need help with the following: 5x - 4y = 13 2y + 3x = -1
Answered by Penny Nom. |
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The substitution method |
2002-11-15 |
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From A student:
Solve by using the substitution method. x = 3y - 1
x + 2y = 9
Answered by Penny Nom. |
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Substitution |
2002-11-06 |
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From John Paul:
I took a math test last week, and there was a problem which the teacher checked as incorrect. It was:
Solve: (a)RcTc=360;(b)RmTm=480;(c)Rm=2Rc; (d)Tm+Tc=15 I solved the problem and I got the following values for each variable.
For Rc=40 For Tc=9
For Rm=96 For Tm=5 I don't see nothing wrong, but the teacher checked it as wrong. Could it be a checking mistake?
Answered by Claude Tardif. |
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18m-11+ -7 |
2002-11-06 |
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From Sophia:
what is 18m-11+ -7 (m = to 12)?
Answered by Penny Nom. |
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Algebra |
2002-09-08 |
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From Heather:
This question is from an 8th grade Algebra classs. I am a parent asking for help to explain to my child. Q: d=25t2.
Answered by Leeanne Boehm. |
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x + 5 + x, if x = 4 |
2002-07-23 |
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From Elisa:
x + 5 + x, if x = 4
Answered by Leeanne Boehm. |
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The substitution method |
2002-02-24 |
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From Joe:
whats the answer to this question? 3x+y=11
x+2y=-3 its substitution method i am having alot of trouble figuring it out. send the answer as soon as possible. thank you
Answered by Penny Nom. |
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The substitution method |
2001-03-05 |
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From A student:
Solve each system of equations by the substitution method. Show your work. - y = 8
7x = 1 - y
- y = x - 1
4x - y = 19
Answered by Penny Nom. |
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Some integration problems |
2000-02-23 |
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From Tim Valentine:
I am having a great deal of difficulty with the following integrals, can you help? I think they need the use of trig substitution or integration by parts but I cannot figure out how to begin. Thanks! The integral of 1/(2+3x2) dx. and The integral of x * square root of (4x+5) dx.
Answered by Harley Weston. |
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Algebre |
2009-03-04 |
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From Jonnathan:
Pour entrer sur le site d'une exposition, il en coute 41$ pour 2 enfants et 2 adultes mais 37.50$ pour 3 enfants et un adulte. Quel est le prix de la rentree pour l'enfant et quel est le prix de la rentree pour l'adulte? il faut utiliser la methode de comparaison ou de substitution
Answered by Claude Tardif. |
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