Multiply the first equation through by 13: 13x+3y=-21; now divide the second equation through by 3: 24=-2x+3y. This matches the y term in both equations, so we can eliminate y by subtraction: the equations we have are 13x+3y=-21 and -2x+3y=24. Subtract the former from the latter: -15x=45, so x=-3. Substitute this value into -2x+3y=24: 6+3y=24; 3y=18, so y=6. Solution: x=-3, y=6.