Question 741094
Put each of the equations in y = mx + b form

2x + y = -8 becomes y = -2x - 8

-x + y = 4 becomes  y = x + 4

Graph each on the same coordinate plane, using the slope and the y-intercept.  Where the two lines intersect, that is where the solution is.

If you have a graphing calculator, you can graph them there for the solution as well.