tlng krjain soalnya + caranya ya guys thanks......

22. misal : mobil : x , motor : y
3x+5y = 17 |×4| 12x+20y = 68
4x+2y = 18 |×3| 12x+6y = 54 (atas & bwh dikurangi )= 14y = 14 -> y=1
4x+2y = 18
4x+2(1) = 18
4x = 18 - 2
4x = 16
x = 4
20x+30y
20(4)+30(1)
80+30=110.000

maaf no 25 aku kg bisa, maaf juga klo jawbnya salah