# derivation of slope formula

Solution: Slope of A Line ,

Slope of a line joining the point P(x1,y1) and Q(x2 ,y2)

$\\ \Rightarrow tan\alpha =m=(y2-y1)/(x2-x1)$

Let the equation of straight is  ,

$\\ax+by+c=0\\ \Rightarrow by=-ax-c \\ \\\Rightarrow y=-(a/b)x-(c/b)$

$\\ m=-(a/b)$

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