Solve the system by the addition method. Be sure to check all proposed solutions. x - 6y = -15 7x - 6y =-33 A) {(-3, 2)} B) {(-2, -3)} C) {(-2, 1)} D) x + y = 2 x - y = 14 A) {(-8, -5)} B) {(7, -5)} B) {(7, -5)} C) {(8, -6)} D)