Question

What is the slope of the line perpendicular to `y=9/4x-7`?

Answer 1

`(-4/9)`

Explanation:

If a line has a slope of `m`
all lines perpendicular to it will have a slope of `(-1/m)`

`y=9/4x-7` is a line in "slope-intercept" form
with a slope of `9/4`

Therefore any line perpendicular to it will have a slope of
`color(white)("XXX")-1/((9/4)) = -4/9`