Question

Solve
- x - y = 4
x - y = -8

Answer 1

-2y=-4

Answer 2

y=2

Answer 3

x=-8+2

Answer 4

x=-6

Answer 5

You have to find the value of 1 variable in terms of the other.
x= -8+y, and then you would plug this into the other equation

Answer 6

or use elimination like i did

Answer 7

^ Yeah.. in this case, it would actually be faster than substituting =]