Answer:
0
Step-by-step explanation:
The slope of a line is a measure of its "steepness." To make that more precise, it's the rate of change of its vertical and horizontal coordinates, its
[tex]\Delta y/\Delta x[/tex], where Δ means "change in"
This never changes its y coordinate, so we could say its slope is [tex]0/\Delta x[/tex], or just 0.
