Solve graphically the system of linear equations:x-y=1x+3y=9

x - y = 1
-x - 3y = -9 = -4y = -8 = y = 2
Then use the easiest equation from before.
Use 2 for y.
x -1(2) = 1
x - 2 = 1 = x = 3
Answer: (3, 2) Hope this helps :)