Well,subtract 3/4 from each side to get z by itself. Then, since it is less than or equal to, the dot is filled in, and start at -1.5(I believe.*doesn't have calculator*), going left on the number line.
Well, I know you graph it with a closed circle... but it's kind of confusing to me since it isn't in inequality form .-. I'm sure you can figure out which way the arrow goes, though.