We had the following:

x - 2y = 3	-3	-3x + 6y = -9
3x - 3y = 3		3x - 3y = 3

Adding the equations on the right gave us

3y = -6,   so that
y = -2.

Substituting y = -2 into the first equation gives

x - 2(-2) = 3,   so that
x + 4 = 3,   giving
x = -1.

Thus, the solution is (x, y) = (-1, -2)

Close this window to return to the tutorial.
Lost the tutorial to which this window is attached? Press here.