1. ## perpendicular line equation

Find a number 't' such that the line in the xy-plane containing the points (-7,t) and (20,7) is perpendicular to the line y = -5x + 999

We're solving for 't'

Thank you.

2. ## Re: perpendicular line equation

Originally Posted by jonathanraxa
Find a number 't' such that the line in the xy-plane containing the points (-7,t) and (20,7) is perpendicular to the line y = -5x + 999
Solve $\left(\frac{-7-20}{t-7}\right)=-5$ for $t$.

3. ## Re: perpendicular line equation

Originally Posted by jonathanraxa
Find a number 't' such that the line in the xy-plane containing the points (-7,t) and (20,7) is perpendicular to the line y = -5x + 999

We're solving for 't'
perpendicular slopes are opposite reciprocals ...

$\frac{7-t}{20-(-7)} = \frac{1}{5}$