solve the simultanious equations: x - 2y = 2 and 2x + y = -1

I would first isolate x in the first equation in the left hand side (x = 2 + 2y). Then I would replace the x in the second equation with the right hand side of the first equation, making the second equation one variable (4 + 4y +y = -1). I would find y (y = -1) and put back on teh first equation and solve for x (x = 0).