Question

How do you graph `y < x^2- 5x`?

Answer 1

We seek a graph of the region `y lt x^2-5x`

First we draw the graph of the parabola `y=x^2-5x`
graph{y=x^2-5x [-3, 8, -8, 4]}

Then the sought region is that below the parabola:
graph{y-x^2+5x<0 [-3, 8, -8, 4]}