silvanna0000 silvanna0000 11-12-2020 Mathematics contestada 1. Which of the following systems is (2, -3) a solution? (Choose all that apply) a. x+y = -1 b. 2x-y=7 c. 10x + 2y = 28 3x + y = 3 5x + y = 14 6x - 3y = 21 d. 9x - 5y = 33 7x + 2y = 8