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3x+2y=4 (metode subtitusi)
3x-3y-9=3x+2y-4=0
3x-3x-3y-2y-9+4=0
-5y-5=0
-5y=5
y=5/-5
y=-1
lalu y dimasukan kedalam salah satu himpunan, 3x-3y=9
3x-3(-1)=9
3x-(-3)=9
3x+3=9
3x=9-3
3x=6
x=6/3
x=2