Answer
$y=2$.
Work Step by Step
If two lines are parallel then their slopes must be equal.
If it is parallel to $y=5$, then the equation must be $y=m$. $(4,2)$ is on the line, hence $y=2$.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.