Question

solve by substitution*

-7x - y = -6
x - 2y = -12

Answer 1

This one is easy.

-7x-y=-6
x-2y=-12
We take value of x in terms of y from the second equation:
x=2y-12
And substitute it in the first equation:
-7(2y-12) - y =-6
-14y + 84 - y=-6
-15y +84=-6
84+6=15y
90=15y
90/15=y
6=y.......................First Answer.
Substitute in equation 2:
x-2(6)=-12
x-12=-12
So, x=0.
There's our answer: x=0, y=6.