Diketahui sistem persamaan 5x + 3y = 17 dan x - 4y = 8.nilai dari 6x + 2y adalah... A. -10 B. -6 C. 14 D. 22

Mapel : Matematika

Kelas : 7
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5x + 3y = 17

x - 4y = 8


Ditanya → 6x + 2y


Jawaban :
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x - 4y = 8

x = 8 + 4y....... (1)


→ Subtitusi nilai x

5x + 3y = 17

5(8 + 4y) + 3y = 17

40 + 20y + 3y = 17

23y = 17 - 40

23y = - 23

y = -23/23

y = - 1 ✔



Tentukan nilai x :

x = 8 + 4y

x = 8 + 4(-1)

x = 8 - 4

x = 4


Maka,

= 6x + 2y

= 6(4) + 2(-1)

= 24 - 2

= 22 ✔

Jawaban: D. 22

Semoga membantu :)