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5b + 4p = 3.300 |x2| 10p + 8p = 6.600
-6p = -1200
p = 200
10b + 2p = 5.400
10b + 2.200 = 5400
10b + 400 = 5400
10b = 5400 - 400
10b = 5000
b = 500
3b + 5p
3.500 + 5.200
1500 + 1000
2500
pensil = y
10x + 2y = 5.400
5x + 4y= 3.300
eliminasi x
10x + 2y = 5.400
10x + 8y = 6.600 -
-6y = -1.200
y = -1.200/-6
y= 200
subtitusikan y=200 ke 5x+4y=3.300 jadi.
5x + 4.200 = 3.300
5x = 3.300 - 800
5x = 2.500
x = 2.500/5
x = 500
jadi harga buku : Rp. 500 , harga pensil : Rp. 200
b) 3x + 5y = ?
3.500 + 5.200 = 1.500 + 1.000
= 2.500
jadi harga 3buku dan 5pensil adalah Rp. 2.500