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diketahui:
mobil= x
motor= y
3x+5y=17.000
4x+2y=18.000
ditanya:
20x+30y=...?
jawab
langsung eliminasi x
3x+5y=17.000 |×4|
4x+2y=18.000 |×3|
menjadi
12x+20y=68.000
12x+6y=54.000
_____________-
14y=14.000
y=1000
3x+5y=17.000
3x+5(1000)=17.000
3x+5000=17.000
3x=12.000
x=4000
maka
20x+30y=
20(4000)+30(1000)=
Rp110.000
jawaban C
semoga membantu jawaban ini