What you must do for this case is to solve the system of two equations with two unknowns. To find the values of x and y. We have then: -3x + 9y = 36 4x + 12y = 24 Resolving: Step 1: (1/3) * (- 3x + 9y) = (36) * (1/3) (1/4) * (4x + 12y) = 24 * (1/4) -x + 3y = 12 x + 3y = 6 Step 2: 6y = 18 y = 18/6 y = 3 Step 3: -x + 3y = 12 -12 + 3y = x -12 + 3 (3) = x x = -3 answer: x = -3 y = 3
