Slope of the line passing through (7,-5) and (3,11) =
[tex] \frac{11 - ( - 5)}{3 - 7} [/tex]
= -4
As two lines are perpendicular to each other, so when their slopes are multiply by each other, the answer will be -1
so the slope of the line passing through (-3,-9) and (5,n) will be
[tex] \frac{1}{4} [/tex]
So will will get a formula below
[tex] \frac{n - ( - 9)}{5 - ( - 3)} = \frac{1}{4} [/tex]
and the answer will be n=
[tex] - 7[/tex]
