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więc
y=-3/5x+b
-1= -3/5*15+b
-1=-9+b
b=8
y=-3/5x+8
Prostopadła, czyli
więc
-3/5*a=-1
a=5/3
-1=5/3*15+b
-1 = 25+b
b=24
y= 5/3x+24