Ok, we need to dolve by subtitucion;
- 3x – 10 = y
-x - 8y = 11
So, we are going to replace y in the second equation:
-x-8(-3x-10)=11
-x+24x+80=11
23x+80=11
23x=-69
x=-69/23
x=-3
Replacing x in the first equation:
-3(-3)-10=y
9-10=y
y=-1
So, finally we get (-3,-1)