Question

Di halaman sekolah terdapat motor dan mobil berjumlah 25. jumlah roda seluruhnya berjumlah 80 buah. berapakah banyak mobil???????? plisss mohon bantuannya yaa

Answer 1

M = jumlah mobil
t = jumlah motor

t + m = 25
t = 25 - m

2t + 4m = 80
2(25 - m) + 4m = 80
50 - 2m + 4m = 80
2m = 80 - 50
2m = 30
m = 15

Answer 2

Misalkan motor = x
mobil = y

x+y = 25 --> y = 25-x (substitusika)
2x+4y = 80
2x + 4(25-x) = 80
2x + 100 - 4x = 80
-2x = 80-100
x = -20/-2
x = 10 motor

y = 25-x = 25-10 = 15 mobil