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pensil = y
4x+3y = 13.500 (x2)
3x+2y = 9.750 (x3)
sehingga
8x + 6y = 27.000
9x + 6y = 29.250 -
-1x = -2250
maka x = 2250
subtitusikan
3x + 2y = 9.750
3.2250 + 2y = 9.750
6750 + 2y = 9750
2y=9750-6750 = 3.000
maka y = 3.000/2 = 1.500
maka x=2250, dan y=1.500
2x + 3y
2 x 2250 + 3 x 1.500
4.500 + 4.500
=9.000
3x+2y=9750 | 4| 12x+8y=38600
--------------- -
Y=1900
4x+3y= 13500
4x+3(1900)= 13500
4x+5700= 13500
4x=13500-5700
X=7800/4
X=1950
X=buku ,y=pensil
Jd 2x+3y = 2(1950)+3(1900)
3900+5700=9600