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Zad.1a
A= (3,1) y= ax+b
1= 3a +b /·(-1)
B=(9,-1) -1 = 9a +b
-1 = -3a -b
-1 = 9a +b dodajemy stronami
....................
-2 = 6a /:(-2)
a= -2/6
a= -1/3
1= 3·(-1/3) +b
1= -1 +b/+1
2=b
y= -1/3x +2
C=(m-1, m+3) m+3= -1/3(m-1) +2
m+3= -1/3m +1/3 +2
m+3= -1/3m +7/3 / + 1/3m , -3
m+1/3m = 7/3 -9/3
4/3m = -2/3 /·3/4
m= -1/2
Odp. m= -1/2