dik sistem persamaan 3q+5y=-9 dan 5q+7y=-19 tentukan nilai 4q+3y=

semoga jawabanya membantu:)

MAPEL = MATEMATIKA
KELAS = 8
BAB = SPLDV

eliminasi nilai q
3q + 5y = -9 |×5
5q + 7y = -19 |×3

15q + 25y = -45
15q + 21y = -57
_____________-
4y = 12
y = 12/4
y = 3

subtitusi nilai y
3q + 5y = -9
3q + 5(3) = -9
3q + 15 = -9
3q = -9 - 15
3q = - 24
q = -24 ÷ 3
q = -8

nilai 4q + 3y :
= 4(-8) + 3(3)
= -32 + 9
= -23

semoga membantu