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2x + 3y = 12 (kali 2) 4x + 6y = 24
4x - 7y = - 2 (kali 1) 4x - 7y = - 2
___________ _
13y = 26
y = 2
x = 3
Dengan substitusi:
2x + 3y = 12
2x = 12 - 3y
4x = 24 - 6y substitusikan ke:
4x - 7y = - 2
(24 - 6y) - 7y = - 2
24 - 13y = - 2
- 13y = - 26
y = 2
x = 3
Dengan grafik lihat lampiran: