Question

QUIZ (1333)
Materi: SPLDV

Diketahui dua persamaan 11x + 12y = 178 dan 5x + 7y = 84. Maka nilai dari x + y adalah...
A. 16
B. 20
C. 24
D. 28​

Answer 1

Verified answer

Jawab:

Penjelasan dengan langkah-langkah:

11x + 12y = 178 (x5)

5x + 7y = 84 (x11)

55x + 60y = 890

55x + 77y = 924 _

- 17y = - 34

y = -34/(-17)

y = 2

5x + 7(2) = 84

5x + 14 = 84

5x = 84 - 14

5x = 70

x = 70/5

x = 14

x + y = 14 + 2 = 16

Answer 2

11x + 12y = 178|×5 | 55x + 60y = 890

5x + 7y = 84. |×11| 55x + 77y = 924

_____________-

-17y = -34

y = 2

55x + 60y = 890

55x + 60.2 = 890

55x = 770

x = 14

x + y

14 + 2

16