Odpowiedź:
zad 4
3(x + 1) + y = 6
2(x + 1) - 4y = 4
3x + 3 + y = 6
2x + 2 - 4y = 4
3x + y = 6 - 3
2x - 4y = 4 - 2
3x + y = 3 | * 4
2x - 4y = 2
12x + 4y = 12
2x - 4y = 2
dodajemy równania
12x + 2x + 4y - 4y = 12 + 2
14x = 14
x = 14/14 = 1
2x - 4y = 2
2 * 1 - 4y = 2
2 - 4y = 2
- 4y = 2 - 2 = 0
y = 0
Odp: x = 1 , y = 0
