Question

Which equation combines with the given equation to form a system of equations with the solution x = 3 and y = 9?

A.x + 2y = 21



B.4x + 6y = 64



C.2x + y = 36



D.4x + y = 21



E.-3x + 4y = 33



F.3x + 2y = 28

Answer 1

its out of A  and D ..........................

Answer 2

subsitute in all to see which ones have tthose solutions
subsitute 3 for x and 9 for y

A works
B is false
C is false
D is true
E is false
F is false

answer is A and D