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L: -y=-6x/:(_1)
y=6x zatem a=6
k: y=6x+b
1=-6+b
7=b
Wyznacz równanie prostej AB. A(-4,-2) B(5,4)
{-4=-2a+b
{4=5a+b
{-b=-2a+4, b=2a-4
{4= 5a+(2a-4)
4= 5a+2a-4
8=7a/:7
a=8/7
b= 16/7-28/7=-12/7
równanie prostej
y= 8/7x-12/7