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 Topic: system of linear equations
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 A system of linear equations 2016-01-24 From kareem:my name is kareem and i am a student i have a math puzzle and i tried to solved it but it always have same mistake x-y=9 x+z=12 z-n=14 y+n=2Answered by Penny Nom. An algebra exercise 2007-01-24 From Clara:Given x + 2y = -2 and x - 2y = 18, find: a) x^2 - 4y^2 b) x^2 + 4y^2Answered by Stephen La Rocque and Penny Nom. Mr.Carter is very cautious 2003-11-26 From Bob:Mr.Carter is very cautious. He decides to invest in only three stocks: one low stock, one high stock, one medium stock. Given that the expected annual yields are 6% for low stock, 7% for medium stock, and 8% for high stock, he wants his investment in medium stock to be half of his total investment in low and high stock. How much should I invest in each type fo stocks to expect a total annual return fo \$650 form my investments?Answered by Harley Weston. Two equations 2002-07-26 From Derek:1. 3x + 2y = 4 2. -7x + 2y = 24 finding x and y. Answered by Penny Nom. An augmented matrix 2002-04-20 From A student:Hi my math teacher asked us to solve an augmented matrix. I am in twelfth grade and need help. The book we are working on is college algebra. Here it is a+2b+c=0 2a+5b+4c=-1 a-b-9c=-5 Answered by Penny Nom. Pairs of equations 2002-04-04 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. Two linear equations 2000-09-14 From David Dean:2a + 1b = 3.39 3a + 3b = 6.59 What formula do I use to find what a = ? Answered by Harley Weston. The equation of a parabola 2000-05-22 From Ian Forsyth:Given the points A(0,0) B(60,10) C(24,d) find the equation of the parabola. leave the equation in terms of x, y and d if the general form of a quadratic is y = ax2 + bx + c.Answered by Penny Nom. A matrix equation 2000-05-14 From A student:Right now, we are dealing with matrices and we are supposed to solve the following problem on our graphing-calculators: 2a+3b-4c+d=20 a-2b+3c-5d=-14 3a+4b-2c+3d=19 5a-b+6c+4d=-5Answered by Penny Nom. Taxis in Chicago 2000-03-27 From A high school student high school student:Suppose that taxis pick up and deliver passengers in Chicago, which is divided into three zones. Records kept by the drivers show that of the passengers picked up in Zone 1, 50% are taken to a destination in Zone 1, 40% to Zone 2, and 10% to Zone 3. OF the passengers picked up in Zone 2, 40% go to Zone 1, 30% to Zone 2, and 30% to Zone 3. Of the passengers picked up in Zone 3, 20% go to Zone 1, 60% to Zone 2 and 20% to Zone 3. Suppose that at the beginning of the day, 600 of the taxis are in Zone 1, 100 in Zone 2, and 300 in Zone 3. What is the distribution of taxis in the various zones after all have had two riders?Answered by Harley Weston. A system of equations in five unknowns 2000-03-20 From Will:I have been having some problem with the following question for some time. I would appreciate any help on solving the problem or a solution. Q: Assume that a system of equations in the unknowns x1, x2, x3, x4 and x5 when converted to row echelon form gives ...Answered by Penny Nom.

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