Question

How do you graph `y=sqrt(x-3)` and how is it different from the parent function?

Answer 1

You take values for `x`, preferably values that are a square +3.

Explanation:

In that case you'll get "easy" values for `y`
`x=3,4,7,12` will yield:
`y=0,1,2,3`

This is an `x`-translation from `sqrtx`. The whole function is moved `3` to the right, as now `x=3` will give `y=0`
graph{sqrt(x-3) [-1.12, 18.88, -1.32, 8.68]}