Question

Which system of equations has the same solution as the system
below?
2x + 2y = 16
3x - y = 4
(1) 2x + 2y = 16 (3) x + y = 16
6x - 2y = 4 3x - y = 4
(2) 2x + 2y = 16 (4) 6x + 6y = 48
6x - 2y = 8 6x + 2y = 8

Answer 1

(1)
(2)
(4)

If one equation is the same, check the other for being a multiple. If it is a multiple, and all other equations are the same then it yields the same set of solutions.