SOLUTION: determine whether the graphs of the equations are perpendicular. 8x-7y=3 8y-7x=9

Algebra ->  Graphs -> SOLUTION: determine whether the graphs of the equations are perpendicular. 8x-7y=3 8y-7x=9      Log On


   

Question 446087: determine whether the graphs of the equations are perpendicular.
8x-7y=3
8y-7x=9
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

8x-7y=3
8y-7x=9
first find their slopes; write them in slope-intercept form
8x-7y=3...->...-7y=8x%2B3...->...y=%288%2F-7%29x%2B3%2F-7...->...y=-%288%2F7%29x-3%2F7
slope is: m=-%288%2F7%29

8y-7x=9...->...8y=7x%2B9...->...y=%287%2F8%29x%2B9%2F8
slope is: m1=7%2F8
since m=-%288%2F7%29 is an inverse of m1=7%2F8, lines are perpendicular
let's see it on a graph: