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Persamaan 2 -> 4x - y = 5
3x + y = 9
y = 9 - 3x (substitusikan ke persamaan 2)
4x - y = 5
4x - (9 - 3x) = 5
4x - 9 + 3x = 5
7x - 9 = 5
7x = 5 + 9
7x = 14
x=2 (substitusikan x ke persamaan)
3x + y = 9
3(2) + y = 9
6 + y = 9
y = 9 - 6
y = 3
Jadi x = 2; y = 3
Substitusi y nya ke 3x+y=9 jadi 3x+(4x-5)=9
7x=14
x=2
Masukin x nya buat nyari y
3(2)+y=9
y=9-6
y=3