Question

What is x=0 and x=5 on a graph

Answer 1

x=0 forms a vertical (up and down) line on the on point 0 on the x-axis, and x=5 forms a vertical line on point 5 on the x-axis

Answer 2

All vertical lines have an equation in the form x=... The number indicates the x -intercept. The line x=0 is the equation for the y-axis.

Since x=5 is a vertical line, there is no y-intercept and the slope is undefined.