Answer: x=-1, y=5
Explanation:
First, 7x+12 is substituted in for y in the second equation
7x+12=-8x-3
Add 8x to both sides
15x+12=-3
Subtract 12 from both sides
15x=-15
Divide both sides by 15
x=-1
To solve for y, substitute x into the first equation
7(-1)+12=y
-7+12=y
5=y