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y=2/3x-5/3
A=(1,-2)
a) prosta równoległa
y=2/3x+b
-2=2/3*1+b
b=-2-2/3
b=-2i2/3
y=2,3x-2i2/3
b) prosta prostopadła
y=-3/2x+b
-2=-3/2*1+b
b=-2+3/2
b=-1/2
y=-3/2x-1/2