Mashaal Masha
In the $xy$-plane, the graph of $y=x^{2}-9$ intersects line $p$ at $(1,a)$ and $(5,b)$, where $a$ and $b$ are constants. What is the slope of line $p$?
Difficulty: Hard
A: 

$6$

B: 

$2$

C: 

$-2$

D: 

$-6$

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