Subtract the second equation from the first: 3x=-2-4=-6. Divide through by 3 and we get x=-2. Substitute x=-2 in either equation and we get -12-2y=-2 which is the same as 12+2y=2. Subtract 12 from each side: 2y=-10 so, dividing through by 2, y=-5. The second equation should give the same result: -6-2y=4. Add 6 to each side: -2y=10, so -y=5 which is the same as y=-5.