Step 1
-7x - y = 0
7x + 8y = -6
Step 2
Choose equation 1 and make y subject of relation
y = -7x
Step 3
Substitute y in equation2
7x +8(-7x) = -6
7x -56x = -6
-49x = -6
x = 6/49
Step 4
Substitute x in equation 1
y = -7x
[tex]\begin{gathered} y\text{ = -7 x }\frac{6}{49} \\ y\text{ = }\frac{-6}{7} \end{gathered}[/tex]