Given the equations:
-x + 6y = -8.......................................................(1)
x - 6y = 8 .........................................................(2)
Let's solve this using substitution method.
Make x the subject of the equation in equation 2:
x - 6y = 8
Add 6y to both sides:
x - 6y + 6y = 8 + 6y
x = 8 + 6y
Substitute (8 + 6y) for x