48 items are filed under this topic.
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Eliminate y |
2011-04-07 |
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From Lynn:
2x + y = 8
y + 3z =5
z + 2w =1
5w + 3x = 9
Form three equations with y eliminated
Answered by Penny Nom. |
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Simultaneous equations |
2010-12-05 |
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From ryan:
Question from ryan, a student:
3 4
-- - -- = 1 (1)
x y
7 2 11
-- - -- = -- (2)
x y 12
Answered by Chris Fisher and Stephen La Rocque. |
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A pair of simultaneous equations |
2010-01-09 |
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From Yumiko:
Solve the following pair of simultaneous equations.
x^2 -4x = y^2-4
3y=2x - 3
Answered by Penny Nom. |
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Solving two equations, one with a square root |
2009-11-23 |
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From kacie:
y = square root of x+3
x-4y = -7
im having trouble with this problem...i have to find where they intersect.
Answered by Harley Weston. |
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Simultaneous equations |
2009-08-28 |
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From onias:
solve 3/a - 2/b = 1/2 , 5/a + 3/b = 29/12
Answered by Robert Dawson. |
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Simultaneous Equations |
2009-07-06 |
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From Mukulu:
Solve the equation simultaneously X/5=(Y+2)/2= (Z-1)/4 ……………….eqt 1
3X+4Y+2Z-25=0 ………………eqt 2
Answered by Janice Cotcher. |
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Simultaneous equations with an xy term |
2009-02-01 |
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From angelee:
xy+5x-2y-10=0
2x+y=1
Answered by Penny Nom. |
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Two equations in two unknowns |
2008-10-17 |
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From Dushayne:
Please help me in solving this problem:
a. 3x-4y=32
5x+2y=10
b. 2x+3y=11
4x+3y=10
Answered by Penny Nom. |
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Simultaneous equations |
2008-07-23 |
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From Franco:
Solve
3 D + E - F = -10
-2 D - F = -4
-3 D - 4 E - F = -25
Franco
Answered by Penny Nom. |
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Simultaneous equations |
2008-02-29 |
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From CONOR:
I was wondering if you could help me with this problem
7x - 5y = -1
3y = 4x
Answered by Penny Nom. |
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System of equations |
2007-12-06 |
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From Jenn:
change the equation,x-y=4 to form y=mx+b
the solution to the system of equations y=2x and y=-x+3 is
Answered by Stephen La Rocque. |
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Chicken and goat feet |
2007-12-05 |
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From Kim:
Old McDonald raises goats and chickens. The animals have a total of
100 heads adn 360 feet. How many goats and how many chickens does Mr.
McDonald have?
Answered by Stephen La Rocque and Penny Nom. |
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Four triangles in a square |
2007-10-15 |
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From Kristina:
A square with side lengths of 6 cm is divided into 3 right triangles and a larger isosceles triangle. If the three right triangles have equal area, find the exact area of the isosceles triangle.
Answered by Stephen La Rocque. |
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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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Coin jar |
2007-10-07 |
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From a student:
Sally empties his jar of coins. It contains $3.75 in nickels, dimes, and
quarters. The number of dimes is twice the number of nickels and the number
of quarters is three less than the number of nickels. Determine how many nickels,
dimes, and quarters were in the in the jar.
Answered by Stephen La Rocque. |
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Solving four simultaneous equations (system of four linear equations) |
2007-10-07 |
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From Johan:
I need some help in solving this question
x + 2y - 3z + 4w = 12
2x + 2y - 2z + 3w = 10
0 + y + z + 0 = -1
x - y + z - 2w = -4
Answered by Stephen La Rocque. |
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Finding equations, intersection point of two lines at right angles |
2007-09-22 |
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From Yaz:
Find the equation of the line joining A(-1,-9) to B(6,120). Another line passes through C(7,-5) and meets AB at rigth angle of D. Find the euation of CD and calculate the co-ordinates of D.
Answered by Stephen La Rocque. |
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Finding the radius of an inscribed circle |
2007-07-05 |
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From Maria:
I need to find the radius of a circle which is inscribed inside an obtuse triangle ABC. I know all the angles and all the lengths of the triangle.
Answered by Stephen La Rocque and Chris Fisher. |
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Simultaneous equations : the Elimination method |
2007-06-21 |
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From Patricia:
I need to find the value of X and Y using the Elimination method.
5/x + 3/y=4
25/x-2/y=3
Answered by Stephen La Rocque. |
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Angles of depression |
2007-06-13 |
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From Phonda:
The pilot of a small private plane can look forward and see the control tower for a small airstrip. Beyond that is a large factory that is 3 milies from the airstrip. The angles of depression are 12.5 degrees and 4.8 degrees respectively.
Find the airplane's altitude, to the nearest ten feet.
Answered by Stephen La Rocque. |
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System of equations |
2007-05-24 |
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From Chris:
Find all real solutions (x,y,z,w) of the system of equations:
2y= x + x/17, 2z= y + y/17, 2w = z + z/17, 2x= w + w/17
Answered by Penny Nom. |
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Set up two simultaneous equations |
2007-05-21 |
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From Admire:
The cost of producing windscreen wipers blades at a factory ais partly fixed (due to operating overheads) and partly dependent on the number of blades produced. It costs $300 to produce 1000, and $600 to produce 5000 blades. How much would it cost to produce 24000 blades?
Answered by Penny Nom. |
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A tugboat's speed |
2007-04-30 |
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From Amanda:
a tugboat must travel 24 miles against a 4 mile per hour current on the Potomac River and return. At what
constant speed must the tugboat travel to make the trip in 12 hours. Round answer to the nearest tenth mph.
Answered by Stephen La Rocque. |
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Simultaneous equations |
2007-04-16 |
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From kyrie:
simultaneous equation
4x + 3y = 21
2x * y = 8
Answered by Penny Nom. |
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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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Simultaneous equations with envelopes |
2007-02-08 |
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From Mick:
There were 17 envelopes bought, some were brown, some were white. The brown envelopes cost one cent more per envelope than the white ones. The total cost was 80 cents. How much of each type of envelope was bought? --Many thanks!
Answered by Stephen La Rocque. |
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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 elimination method |
2007-01-31 |
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From Addrianna:
x-2y=2
3x-5y=7
Answered by Stephen La Rocque. |
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Simultaneous equations |
2006-11-06 |
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From An other:
e^2y-x+2=0
ln(x+3)-2y-1=0
Answered by Penny Nom. |
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Simultaneous Equations |
2006-05-24 |
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From Angie:
Question: solve the equations
2x-3y-z=0
3x-2y+z=-5
x+3y-2z=14
for x,y,z
Answered by Stephen La Rocque. |
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2x+5y=3 And -x+3y=-7 |
2006-04-03 |
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From Lloyd:
simplify 2x+5y=3 And -x+3y=-7
Answered by Penny Nom. |
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2x+3y=0 and 3x-y=0 |
2006-03-14 |
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From Lisa:
my name is lisa I am doing math for work and i have a math problem to solve and i need help with it here is the question 2x+3y=0 and 3x-y=0 this is one question can you help me please
Answered by Penny Nom. |
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One boundary of a pond is parabolic in shape. |
2006-01-20 |
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From Glenn:
One boundary of a pond is parabolic in shape. The boundary passes through the points A(-20,45), B(40,40) and E(30,35). The equation of the parabola is of the form y=ax2+bx+c. Find the equation of the parabola and the coordinates of the vertex of the parabola. Any assistance you could provide would be greatly appreciated.
Answered by Penny Nom. |
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Simultaneous Equations |
2005-12-21 |
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From Matt:
I have these two equations,
336 = 60a + 10b
and
432 = 84a + 6b
Am I right in saying both a and b are 4.8?
Answered by Penny Nom. |
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Simultaneous equations |
2005-10-13 |
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From Daniel:
5x + 3y = 22
4x - 7y = -20
Answered by Penny Nom. |
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Two equations |
2002-07-26 |
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From Derek:
1. 3x + 2y = 4
2. -7x + 2y = 24 finding x and y.
Answered by Penny Nom. |
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Pairs of equations |
2002-04-04 |
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From A student:
high school level
student is asking
y=4x x=-4y
x+y=5 3x+2y=20
y=x-1 3x-y=4
x+y=3 2x-3y=-9
x+5y=4
3x+15y=-1
. . .
Answered by Penny Nom. |
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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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Simultaneous equations |
2001-12-17 |
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From Matthew:
4x + y = 4
2x - 3y = 5 what is x and y
Answered by Penny Nom. |
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Two equations in two unknowns |
2001-12-04 |
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From Courtney:
y = 3x + 2
y = 4x - 5
solve for x
Answered by Penny Nom. |
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Common solution |
2001-06-02 |
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From Samantha:
- Solve for common solution: x+y=6 2x-3y=2
- Solve for y in terms of x: 3x-y=4
Answered by Penny Nom. |
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Where do the lines y=2x-4 and y=x-1 intesect? |
2001-04-06 |
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From Bryce:
solve the following problem by setting them equal to each other. Solve for x and y. Where do the lines y=2x-4 and y=x-1 intesect?
Answered by Penny Nom. |
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Systems of equations |
2001-03-16 |
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From joy:
How do u solve problems using systems of equations?
~ finding x and y~ ex:
26 = 3x - 2y
42 = 4x + y
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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Two linear equations |
2000-09-14 |
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From David Dean:
2a + 1b = 3.39 3a + 3b = 6.59
What formula do I use to find what a = ?
Answered by Harley Weston. |
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Simultaneous equations |
2000-03-11 |
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From Laura Molck:
My name is Laura Molck and I am in Year 11 in Australia. Please help me with the following. I know that they are all simultaneous equations which I can do but I have trouble with the formulae to work the equations. Can you please help!! 1. A tent manufacturer produces 2 models, Outback and Bushwalker. From earlier sales records it is known that 20% more of the Outback model is sold than the Bushwalker. A profit of $200 is made on each Outback sold, but $350 is made on each Bushwalker. If during the next year a profit of $177,000 is planned how many of each model must be sold?
Answered by Penny Nom. |
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Systems of linear equations |
2000-03-10 |
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From Ann Marie Devereux:
hi there!!, I guess I have a problem!!! 3x+4y=10 (over)
4x+y=9 2x=5y+3 (over)
x=3y+1
Answered by Penny Nom. |
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Systems of equations |
1999-12-06 |
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From Roger Hornbaker:
I am having problem figuring out x and y solutions. - 5x + y = 4
3x - y = 4 - 3x + 2y = 6
- 3x + y = 0
Answered by Penny Nom. |
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