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3y = 7 - 5x
diubah menjadi:
5x - 4y = - 13
5x + 3y = 7
___________ +
- y = - 6
y = 6
5x = 7 - 18
5x = - 11
x = - 11/5
3y=7-5x diubah menjadi 3y+5x=7
4y-5x=13
3y+5x= 7 +
7y=20
y=20
7
untuk y= 20
7
3y+5x=7
3.20 + 5x=7
7
60 +5x=7
7
5x=7-60
7
5x=-11
7
x=-11
7
5
x= -11
35