Diketahui 3x + 4y = 7 dan -2x + 3y = -16. Nilai 2x - 7y adalah.... A.-24 B.-4 C.4 D.24 Jawab pake cara

3x + 4y = 7|× 3
- 2x + 3y = - 16|× 4

9x + 12y = 21
- 8x + 12y = - 64
____________—
17x = 85
x = 5

3x + 4y = 7
15 + 4y = 7
4y = 7 - 15
4y = - 8
y = - 2

2x - 7y
= 10 + 14
= 24

Jawaban : D. 24

Maaf Kalau Salah