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3x+4y=780.000 [x2] 6x+8y=1.560.000
------------------------- - ------------------------ -
y=60.000
2x+3y=540.000
2x+3(60.000)=540.000
2x+180.000=540.000
2x=540.000-180.000
2x=360.000
x=360.000÷2
x=180.000
untuk 1 kemeja 2 celana⇒1x+2y
1(180.000)+2(60.000)
180.000+120.000
=300.000