Question

Step by step pls...thank you

Answer 1

`\boxed{phoebe \: is \: right }:`

Explanation:

`the \: slope \: \boxed{ \: m} \: o f \: a \: line \: is \: given \: by \to \\ \boxed{m = (y_(2) -y_(1) )/(x_(2) - x_(1)) } \\ if \: the \: points \: are \to \\ (x_(1) ,\: y_(1)) = (12, \: 5) \\ (x_(2), \: y_(2)) = (12, \: 9) \\ the \: slope \: \boxed{m} \: is \to \\m = ( 9-5 )/(12 - 12) \\ m = (4)/(0) \: \\ \boxed{hence \: the \: slope \: is \: undifined }: \\ \boxed{since \: the \: denominator \: is \: zero \: (0)}`

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