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y=-2/5 x+2
-2/5*(-10)+b=2
4+b=2
b=2
y=-2/5 x+2
Proste prostopadle a1*a2=-1
-2/5*a=-1
a=5/2=2,5
y=2,5x+b
2,5*(-10)+b=2
-25+b=2
b=2+25=27
y=2,5x+27