Answer:
11
Step-by-step explanation:
x + 2y = 24.....x = 24 - 2y
now sub 24 - 2y in for x, back into the other equation
2x + y = 9
2(24 -2y) + y = 9
48 - 4y + y = 9
-4y + y = 9 - 48
-3y = - 39
y = -39/-3
y = 13
x + 2y = 24
x + 2(13) = 24
x + 26 = 24
x = 24 - 26
x = -2
so the value of x + y = -2 + 13 = 11 <===
