Question

How do you graph `-8d < 24`?

Answer 1

If `-8d<24`
then
`d<-3`

You could plot this on a number line by indicating all points to the left of `(-3)` are in the solution set (be careful to indicate `(-3)` is not part of the solution.

If (for some reason) you wanted to "plot" this on the Cartesian plane, you could set your possible `d` values along the vertical axis (normally the y-axis); draw a horizontal line at `y=-3` and shade everything below that line as the solution set.