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April 21, 2014

Homework Help: Algebra(1 of 3)

Posted by Jon on Monday, February 18, 2008 at 11:39am.

Solve the matrix equation 2x + 5y = 1
x + 3y = 0 for y.

A)1
B)3
C)-3
D)-1
I chose D

2x + 5y = 1
y = 5 - 2x
x + 3(5 - 2x)= 0
x + 15 - 6x = 0
7x = 15
x = 15/7
I know thats wrong I don't know what to do

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