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a=( y2-y1) / ( x2-x1)
a=(-4-2) / ( 13+14)
a=-6/27
a=-2/9
lub tak;
y=ax+b
2=-14a+b
-4=13a+b /*(-1)
2=-14a+b
4=-13a-b
-27a=6
a=6/-27
a=-2/9
2=-14a+b
-4=13a+b
b=14a+2
-4=13a+14a+2
-6=27a
a=-6/27= - 2/9