Question

How do you tell whether the graphs of the pair of equations is parallel, perpendicular or neither for `4x+3y=6` and `3x-4y=7`?

Answer 1

`r \bot s`

Explanation:

`r: y = (6 - 4x)/3 = - 4/3 x + 2`

`s: (3x - 7)/4 = y = 3/4 x - 7/4`

`tan (90º - \theta) = - 1 / tan \theta`