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a+b=1
4a+b=5
--------- _
-3a=-4
a=4/3
4/3+b=1
b=-1/3
y=4/3x-1/3 /*3
4x-3y-1=0
wzor w zalaczniku.
d=|2*4-8*3-1|/√(4²+(-3)² = |8-24-1|/√25 = |-17|/5 = 17/5