tiarajohnson810 tiarajohnson810 03-11-2022 Mathematics Answered Select the correct answer. Which equation combines with the given equation to form a system of equations with the solution x = 3 and y = 9? x + 2y = 21 A. OB. O C. O D. OE. 4x+6y=64 2x+y = 36 4x + y = 21 -3x + 4y = 33 3x + 2y = 28