Since you have an equation equal to both x and y, you can either substitute the equation equal to x for x or the equation equal to y for y. x=y-1 y=4-2x I would substitute the y in using 4-2x x=(4-2x)-1 x=3-2x 3x=3 x=1 Then plug in x and solve for y 1=y-1 2=y
