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a(x,y)
M(2,3)
x = 2, y = 3
N(3,1)
x = 3, y = 1
Układ równań.
2a + b = 3
3a + b = 1 /*(-1)
2a + b = 3
-3a - b = -1
(+)--------------------
-a = 2
a = -2
a wynosi -2