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pensil = y
4x + 3y = Rp.13.500,00 | × 2
3x + 2y = Rp.9.750,00 | × 3
=> 8x + 6y = Rp.27.000
9x + 6y = Rp.28.650
---------------------(-)
-x = -Rp.1.650
x = Rp.1.650
subtitusikan peraamaan ( terserah 1 atau 2)
persamaan 2
3(Rp.1650)+ 2y = Rp.9.750
Rp.4.950 + 2y = Rp. 9.750
2y = Rp.9.750 -Rp.4.950
2y = Rp.4800
y = Rp.4800/2 = Rp.2400
ditnya 2x + 3y = 2(1650) + 3 ( 2400)
= 3300 + 7200
= Rp. 10.500,00
maaf klw keliru !
4A + 3B = 13500 X2 = 8A + 6B = 27000
3A + 2B = 9750 X3 = 9A + 6B = 29250 _
A = 1750
>>3(1750) + 2B = 9750
5250 + 2B = 9750
B = 4500 : 2
B = 2250
JADI 2(1750) + 3(2250) = 10250