Elimination using addition and subtraction.
-4x+4y=-20
-2x+4y=-2

For addition:
-4x+4y=-20 (multiply by -1) to get 4x-4y=20
-2x+4y=-2 (Leave as it is) to get -2x+4y=-2
Add together to eliminate the y term
Solve for x (x=9)
Plug in x to either equation to get y (y=4)
(9,4)

For subtraction:
-4x+4y=-20
-2x+4y=-2
Since the equations are already ready for elimination by subtraction, just Subtract to eliminate the y term
Solve for x (x=9)
Plug in x to either equation to get y (y=4)
(9,4)