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2=1/4*(-4)+b
2=-1+b
b=3
y=1/4x+3
b)
y=-x+b
2=0+b
b=2
y=-x+2
c) prostopadła y=1/3x+b
0=1/3*3+b
b=-1
y=1/3x-1
równoległa y=-3x+b
0=-3*3+b
0=-9+b
b=9
y=-3x+9