Answer:
[tex] \boxed{phoebe \: is \: right }: [/tex]
Step-by-step explanation:
[tex]the \: slope \: \boxed{ \: m} \: o f \: a \: line \: is \: given \: by \to \\ \boxed{m = \frac{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 = \frac{ 9-5 }{12 - 12} \\ m = \frac{4}{0} \: \\ \boxed{hence \: the \: slope \: is \: undifined }: \\ \boxed{since \: the \: denominator \: is \: zero \: (0)}[/tex]
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