jika diketahui SPLDV 4x+3y=13 dan 4x-3y=-29, maka nilai 2x+3y adalah... a.5 b.15 c.17 d.25 harus pakek cara iyahhh

MAPEL = MATEMATIKA
KELAS = 8
BAB = SPLDV

4x + 3y = 13.......( 1 )
4x - 3y = -29......( 2 )

ditanya : nilai 2x + 3y ???

------------- SPLDV --------------
------ metode eliminasi ------

eliminasi nilai 4x pada pers. ( 1 ) dan ( 2 )
4x + 3y = 13
4x - 3y = -29
___________-
6y = 42
y = 42/6
y = 7

subtitusi nilai y = 7 pada pers. ( 1 )
4x + 3y = 13
4x + 3(7) = 13
4x = 13 - 21
4x = -8
x = -8/4
x = -2

nilai 2x + 3y :
= 2(-2) + 3(7)
= -4 + 21
= 17

jawaban C.
semoga membantu