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Verified answer
Jd pendapatan tukang parkir saat itu adalah Rp. 240.000a = banyaknya motor
b = banyaknya mobil
maka
a + b = 75 (pers.1)
2a + 4b = 210
kita dapat mengeliminasi variabel a
2a + 2b = 150 -----(hasil dari pers. di atas yg dikali 2)
2a + 4b = 210
-------------------- -
0 - 2b = -60
b = -60/-2
b = 30
maka
a + b = 75
a = 75 - b
a = 75 - 30
a = 45
maka pendapatan tk parkir
= 30 (5000) + 45 (2000)
= 150000 + 90000
= Rp. 240.000,-