tolong jawab ya besok di kumpul

2b.
2x + y = 9 dikali 1 -> 2x + y = 9
x + 2y = 3 dikali 2 -> 2x + 4y = 6
. dikurang
. -> -3y = 3
. -> y = 3/-3
. -> y = -1
x + 2(-1) = 3
x = 3 + 2
x = 5