ini jawaban nya apa ?

9x - 12y = 23
5x - 9y = 12

9x - 12y = 23|× 3
5x - 9y = 12|× 4

27x - 36y = 69
20x - 36y = 48
___________ _
7x = 21
x = 21 ÷ 7
x = 3

5x - 9y = 12
15 - 9y = 12
- 9y = 12 - 15
- 9y = - 3
y = 3/9
y = ⅓

4x - 3y
= 12 - 1
= 11

Jawaban : D. 11

Maaf Kalau Salah