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y=pensil
Eliminasi
3x+3y=20.400 (dikali 2)
2x+4y=19.200 (dikali 3)
6x+6y=40.800
6x+12y=57.600 (dikurangi)
-6y=-16.800
y=-16.800/-6
y=2.800
Subsitusikan y=2.800 ke persamaan 3x+3y=20.400
3x+3y=20.400
3x+3(2.800)=20.400
3x+8.400=20.400
3x=20.400-8.400
3x=12.000
x=12.000/3
x=4.000
HP: (4.000,2.800)
Jdi membeli 5 buku dan 2 pensil
5x+2y
=5(4000)+2(2800)
=20.000+5.600
=25.600
JAWABANNYA "A"