Question

What is the slope of the line $y=9$?

Answer 1

Change $y=9$ in the slope intercept form: $y=mx+c$, where $m$ is the slope of the line and $c$ is the $y$-intercept.

$y=0\left(x\right)+9$

Comparing the equation $y=0\left(x\right)+9$ with the equation $y=mx+c$, we get that $m=0$.

Hence, the slope of the line is $0$.