harga 3 kg gula pasir dan 4 liter minyak goreng RP44.600. sedangkan harga 2 liter minyak goreng dan 5 kg gula pasir RP44000. harga 4kg gula pasir adalah....

3x + 4y = 44600(*1)
5x + 2y = 44000(*2)

3x+4y = 44.600
10x+4y = 88.000
------------------------- (-)
7x = 43400
x= 6200

3(6200) + 4y =44.600
18.500+4y = 44.600
4y = 44.600-18500
y = 26100/4 = 6525

4(6200) = 24800

x = Gula pasir
y = minyak goreng

3x+4y=44.600. |×2|
5x+2y=44.000. |×4|
----------------------------
= 6x+8y= 89.200
20x+8y= 176.000.
--------------------------- (-)
= -14x = -86.800
x= -86.800/-14
x= 6200

4x= 4(6200)
= 24.800