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3x + 6y = 24
3x + 5y = 25
-------------------------- dikurang
y = -1
Kemudian pakai metode substitusi
3x + 6y = 24
3x + 6 (-1) = 24
3x - 6 = 24
3x = 24 + 6
3x = 30
x = 30/3
x = 10
3x+5y=25
3x+6y=24 -
-y=1
y=(-1)
subtitusi y ke salah satu persamaan
3x+5y=25
3x+5.(-1)=25
3x-5=25
3x=30
x=10