You can using any equation you want to solve for one of the variables. For instance, if you want to solve for x you turn one of the equations so y is by its self 2x + 3y = 5 4x - y =3
I am going to use 4x - y =3 -y = -4x + 3 y = 4x -3 Now you can substitute 4x - 3 for y in 2x + 3y = 5 and solve for x 2x + 3y = 5 2x + 3(4x - 3) = 5
