text: -7y=9-x\n7y=x-9\n\n2x-7y=4\n2x-(x-9)=4\nx+9=4\nx=-5\n\n-5-7y=9\n-7y=14\ny=-2\n\n\nYou can check and find that it works in both equations.  Or, you could take the value you found for x and solve for y in the other equation and see if you get the same answer.  You do.\n\n(-5,-2) is the answer.\n\nHope this helps!