# Hard SAT Math Question 32 — Video Explanation | 1600.now

Source: https://1600.now/hard/32

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32

Lines $a$ and $b$ are perpendicular. If the points $(8,p)$ and $(9,p+4)$ lie on line $a$, and lines $a$ and $b$ intersect at $(9,p+4)$, which of the following points must lie on line $b$?

A

$(p+8,p-4)$

B

$(9,p-8)$

C

$(p,p+4)$

D

$(5,p+5)$