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kaos = y
jadi 3x+2y=280.000
x+3y = 210.000
eliminasi keduanya ..
menjadi 3x+2y= 280.000 |x1
x+3y = 210.000 |x3
3x+2y= 280.000
3x+39y= 630.000
-7y= -350.000
y=-350.000/-7 = 50.000
subtitusi y=50.000
3x+2y=280.000
3x+2(50.000) = 280.000
3x+100.000=280.000
3x=280.000-100.000 = 180.000
x=180.000/3 =60.000
jadi harga 6 kaos dan 6 baju = 6(50.000)+6(60.000)=300.000+360.000=660.000