harga 5 kg gula dan 3 kg tepung adalah rp 50.400,00. sedangkan harga 3 kg gula dan 5 kg tepung adalah rp 38.400,00 . jika ibu membeli 1 kg gula dan 2 kg tepung

gula = x
tepung = y

5x + 3y = 50.400 ➡ × 5
3x + 5y = 38.400 ➡ × 3

25x + 15y = 252.000
9x + 15y = 115 .200
________________ -

16 x = 136.800
x = 8.550

3x + 5y = 38.400
3(8.550) + 5y = 38.400
25.650 + 5y = 38.400
5y = 38.400 - 25.650
5y = 12.750
y = 2.550

x + 2y =
8.550 + 2(2.550)
8.550 + 5.100
13.650

5g+3t=50.400→x3=15g+9t=151.200
3g+5t=38.400→x5=15g+25t=192.000
------------------------- -
-14t=-40.800
t=40.800/14=2,914 ribu/kg(Rp2.914
/kg)
3g+5t=30.400
3g+5x2,914=30.400
3g=30.400-14.570
3g=15.830
g=5,276 ribu/kg(Rp5.276/kg)

g+2t=5,276+2x2,914=5,726+5,828=11,554 ribu/kg(Rp.11.554/kg)