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y=buku
2x+3y=10.200 (dikali 3)
3x+4y=14.400 (dikali 2)
6x+9y=30.600
6x+8y=28.800 (dikurangi)
y=1.800
Subsitusikan y=1.800 ke persamaan 2x+3y=10.200
2x+3y=10.200
2x+3(1800)=10.200
2x+5.400=10.200
2x=10.200-5400
2x=4800
x=2.400
HP (2.400,1800)
1x+2y
2.400+2(1800)
2.400+3.600
6000
maaf kalo salah.