Question

Here are Janet's steps for solving the system below by eliminating x.

Answer 1

2x + 3y = -1.....(5)
5x + 8y = 0.....(-2)
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10x + 15y = -5
-10x - 16y = 0
-----------------------add
-y = -5
y = 5 <=====this is where Janet messed up

2x + 3y = -1
2x + 3(5) = -1
2x + 15 = -1
2x = -1-15
2x = -16
x = -16/2
x = - 8

solution is : (-8,5)