Question

What's the slope of y=-1?

Answer 1

`0`. See explanation below

Explanation:

We define slope as `m=(y_1-y_0)/(x_1-x_0)`

In a constant function as given `y=-1` we have `y_1=y_0=-1`

And then `m=(-1-(-1))/(x_1-x_0)=0/(x_1-x_0)=0`