Question

Tolong..bantu ya..mohon mbanget

Answer 1

Verified answer

Metode Eliminasi :

2x - 5y + 12 = 0
5x - 2y + 9 = 0

2x - 5y + 12 = 0
2x - 5y = - 12

5x - 2y + 9 = 0
5x - 2y = - 9

(2x - 5y = - 12) × 2
(5x - 2y = - 9) × 5

4x - 10y = - 24
25x - 10y = - 45
____________—
- 21x = 21
x = - 1

(2x - 5y = - 12) × 5
(5x - 2y = - 9) × 2

10x - 25y = - 60
10x - 4y = - 18
____________—
- 21y = - 42
y = 2

3x - 4y
= - 3 - (4 × 2)
= - 3 - 8
= - 11

Jawaban : C. - 11

Maaf Kalau Salah