dibantu ya pakai caranya

No.19

8x-5y = 27 |x3| 24x-15y = 81
3x+5y = 17 |x8| 24x+40y = 136
____________-
-55y = -55
y = 1
8x-5(1) = 27
8x-5 = 27
8x = 32
x = 4

maka 5x + 2y = 5(4) + 2(1) = 22