Odpowiedź:
y = - 3m + 2x + 13 ; m + x + 2y - 16 = 0
m + x + 2y - 16 = 0
2y = - x - m + 16
y = (- x - m + 16)/2
- 3m + 2x + 13 = (- x - m + 16)/2 | * 2
- 6m + 4x + 26 = - x - m + 16
4x + x = 16 - 26 + 6m - m
5x = 5m - 10
x = (5m - 10)/5 = 5m/5 - 10/5 = m - 2
y = - 3m + 2x + 13 = - 3m + 2 * (m - 2) + 13 = - 3m + 2m - 4 + 13 =
= - m + 9 = 9 - m
Otrzymane wartości x i y wstawiamy do równania 3x - 2y - 11 = 0
3 * (m - 2) - 2 * (9 - m) - 11 = 0
3m - 6 - 18 + 2m - 11 = 0
m - 35 = 0
m = 35
