Question

How do you find the slope of y=2?

Answer 1

The slope is zero.

Explanation:

This is the equation representing a perfectly horizontal line. This line neither goes up nor down so its slope, describing the inclination of the line, must be zero.

Also, from the definition of slope `m` you have:
`m-(Deltay)/(Deltax)`
but for every choice of two `x` values you get always `2` as `y` value so that `Deltay=2-2=0`.