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bayam = x kangkung = y
diketahui :
x = 2y
20x + 50y = 225000
ditanya :
25x + 60y = ?
dijawab :
20x + 50y = 225000
20(2y) + 50y = 225000
40y + 50y = 225000
90y = 225000
y = 2500
25x + 60y
= 25(2y) + 60y
= 50y + 60y
= 110y
= 110(2500)
=275000
harga bayam = x
harga kangkung = y
persamaan
x = 2y
20x + 50y = Rp225.000,00
metode substitusi
karena x = 2y maka langsung dimasukkan
20(2y) + 50y = Rp225.000,00
40y + 50y = Rp225.000,00
90y = Rp225.000,00
y = Rp2.500,00
x = 2y
x = 2(Rp2.500,00)
x = Rp5.000,00
25x + 60y = ...
25(Rp5.000,00) + 60(Rp2.500,00) = ...
Rp125.000,00 + Rp150.000,00 = Rp275.000,00