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a) A=(-3,2) B=(0,4)
2=a*(-3)+b |*-1
4=a*0+b
-2=3a-b
4=b
-2=3a-4
2=3a
a=2/3
y=2/3x+4
b) A=(-2,3) B=(-2,-5)
3=a*(-2)+b
-5=a*(-2)+b
3=-2a+b
-5=-2a+b
3=-2a+b
5=2a-b
8=0
uklad nieoznaczony
c) A=(2,4) B=(-1,5)
4=a*2+b
5=a*(-1)+b
4=2a+b
5=-1a+b
4=2a+b
10=-2a+2b
14=3b
b=14/3
4=2a+b
5=-1a+b |*-1
4=2a+b
-5=a-b
-1=3a
a=-1/3
y=-1/3*x+14/3