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a)
Prosta prostopadla:
-3a=-1
a=1/3
y=1/3 x+b
1/3*6+b=5
2+b=5
b=3
y=1/3 x+3
b)
rownolegla
y=-3x+b
-3*6+b=5
b=5+18=23
y= -3x+23