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x=2
-1=-15 +2m
2m=14
m=7
punkt A=(2, -1)
wstawiamy do równania:
x = 2, y = - 1
- 1 = - 4 * 2 + 2m - 7
-1 = - 8 + 2m - 7
- 2m = - 15 + 1
- 2m = -14 |: (- 2)
m = 7