Question

Using a sheet of graph paper, solve the following system of equations graphically. Be sure to show any work, use a straight edge, and be neat. When you are finished, enter the solution set in the box below and turn in your graph paper to your teacher.
x + y = 0
x - y + 2 = 0

Answer 1

Your graph will look like an x (ok, the y axis is at a weird place in my plot). The solution (ie., the point where the two graphs intersect) is at (-1,1).

You can also calculate this by equating the two formulas:

x+y = x-y+2 => 2y = 2 => y=1, x =-1.