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Write (-5,2) and (-5,6) in standard form [if you can describe how to do this for the future]

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\bf \begin{array}{ccccccccc} &&x_1&&y_1&&x_2&&y_2\\ % (a,b) &&(~ -5 &,& 2~) % (c,d) &&(~ -5 &,& 6~) \end{array} \\\\\\ % slope = m slope = m\implies \cfrac{\stackrel{rise}{ y_2- y_1}}{\stackrel{run}{ x_2- x_1}}\implies \cfrac{6-2}{-5-(-5)}\implies \cfrac{6-2}{-5+5}\implies \stackrel{und efined}{\cfrac{4}{0}}

now, an undefined slope, simply means a vertical line, check the picture below.
Write (-5,2) and (-5,6) in standard form [if you can describe how to do this for the-example-1
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