Question

How do you graph `y=1`?

Answer 1

The graph will be a horizontal line.

Explanation:

This function represents a horizontal line passing through `(0,1)` and parallel to the `x` axis. Regardless to the `x` value you choose it will always devolve the value `y=1`.

Graphically:
graph{0x+1 [-10, 10, -5, 5]}