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B(1;2)
4=-3a+b
2=1a+b
b=4+3a
2=a=4+3a
2-4=4a
a=-2:4
a=-0,5
b=4+3×-0,5=4-1,5=2,5
y=-0,5x+2,5
współczynnik kierunkowy a=-0,5, czyli -½
a-współczynnik kierunkowy
4 = -3a+b
2 = a+b
a = 2-b
4 = -3(2-b)+b
4 = -6+3b+b
4 = -6+4b
4b = 10
b = 2,5
a = 2-2,5
a = -0,5