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Mobil = x
Motor = y
3x + 5y = 17.000 |× 2|
4x + 2y = 18.000 |× 5|
6x + 10y = 34.000
20x + 10y = 90.000
------------------------------ --
-14x = -56.000
x = 4.000
Substitusikan x = 4.000 ke
3x + 5y = 17.000
3(4.000) + 5y = 17.000
12.000 + 5y = 17.000
5y = 17.000 - 12.000
5y = 5.000
y = 1.000
Yang ditanyakan :
20x + 30y = ...
=> 20(4.000) + 30(1.000)
= 80.000 + 30.000
= 110.000
Jadi uang yang diperoleh tukang parkir jika ada 20 mobil dan 30 motor adalah
Rp110.000,00