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Math·Algebra·Linear functions

hard

In the xy-plane, line $k$ and line $\ell$ are perpendicular and intersect at the point $(7,5)$. If line $k$ is defined by the equation $y=mx+b$, where $m$ and $b$ are constants and $m>1$, which of the following points lies on line $\ell$?

A

$(8,5-\frac{1}{m})$

B

$(8,5+\frac{1}{m})$

C

$(8,5-m)$

D

$(8,5+m)$