# How do you write the equation of a line in slope intercept, point slope and standard form given Point: (-8, 1) Slope: m is undefined?

The standard form would be $\textcolor{g r e e n}{x = - 8}$
When we say a slope is undefined, we mean that the value of $x$ is a constant $\Rightarrow \Delta x$, the change in $x$ is always $0$ and since the slope is defined as $\frac{\Delta y}{\Delta x}$ the slope is "undefined".