Question

Solve the system of equations by graphing.

x-y=-4
x+y=8

Answer 1

Add the two equations to cancel out y
x+x = 2x
y-y = 0
8-4 = 4

We get: 2x = 4
Thus, x = 2

Substitute in either equation:
2+y = 8

Final: x = 2 and y= 6