# Find the slope, if it exists, of the line containing the pair of points (5, -1) and (5, -10).

Find the slope, if it exists, of the line containing the pair of points (5, -1) and (5, -10).
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Isma Jimenez

Use the slope formula: $m=\frac{{y}_{2}-{y}_{1}}{{x}_{2}-{x}_{1}}$
Let $\left({x}_{1},{y}_{1}\right)=\left(5,-1\right)$ and $\left({x}_{2},{y}_{2}\right)=\left(5,-10\right)$: $m=\frac{-10-\left(-1\right)}{5-5}=-\frac{9}{0}\to$ undefined