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pensil = Y
ilma = 3X + 4Y = 7500
Popi = 2X + 2Y = 4500
tinggal disamain aja
3X + 4Y = 7500
2X + 2Y = 4500 }x2
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3X + 4Y = 7500
4X + 4Y = 9000
__________________-
-1X = -1500 } x -1
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X= 1500
next
2X + 2Y = 4500
2(1500) + 2Y = 4500
3000 + 2Y = 4500
2Y = 4500 - 3000
2Y = 1500
Y = 650
Jadi harga 1 buku 1500 dan 1 pensil 650
bila Shisi ingin membeli 1 buku dan 1 pensil maka
1X + 1Y
=1(1500) + 1(650)
=1500 + 650
=2150
=> 3x+4y=7.500 |2| 6x+8y=15.000
2x+2y=4.500 |3| 6x+6y=13.500 -
2y=1.500
y=750
<=> 2x+2y=4.500
2x+2(750)=4.500
2x+1500=4.500
2x=4.500-1500
2x=3.000
x=1.500
=>> buku dan pensil yang harus dibayar Shisi
= 1x+1y
= 1(1.500)+1(750)
= 1500+750
= 2.250