Recall that the formula for slope is
[tex]\text{slope}=\frac{rise}{\text{run}}[/tex]
Here rise =BC and run = AC.
[tex]\text{slope of n}=\frac{BC}{AC}[/tex]
And also rise =DE and run =AE
[tex]\text{slope of n}=\frac{DE}{AE}[/tex]
Hence the slope of n is equal to BC/AC
and the slope of n is equal to DE/AE
