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pensil = y
4x+3y = 13.500 | *3 12x+9y = 40.500
3x+2y = 9.750 | *4 12x+8y = 39.000
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y = 1500
4x+3y =13.500
4x +3.1500 = 13.500
4x+ 4500 = 13.500
4x = 13500-4500
4x =9000
x = 2.250
jadi 2 buku dan 3 pensil -----> 2 x 2250 + 3 x 1500 = 4.500 +4500 = 9000