Answer
$y=5$
Work Step by Step
Using $y-y_1=m(x-x_1)$ or the Point-Slope Form, the equation of the line with slope 0 and passing through $(2,5)$ is
\begin{array}{l}
y-5=0(x-2)
\\\\
y-5=0
\\\\
y=5
.\end{array}
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