Mashaal Masha
Line $t$ in the $xy$-plane has a slope of $-\frac{1}{3}$ and passes through the point $(9,10)$. Which equation defines line $t$?
Difficulty: Medium
A: 

$y=13x-\frac{1}{3}$

B: 

$y=9x+10$

C: 

$y=-\frac{x}{3}+10$

D: 

$y=-\frac{x}{3}+13$

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