SAT Math Practice Question #17252 - SATify | SATify

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SAT Math Practice Question #17252 - SATify | SATify

#17252

quadratic equations

coordinate geometry

hard

180 sec

In the $x y$ -plane, the graph of the equation $y = - x^{2} + 9 x - 100$ intersects the line $y = c$ at exactly one point. What is the value of $c$ ?

A.

$- \frac{481}{4}$

B.

$- 100$

C.

$- \frac{319}{4}$

D.

$- \frac{9}{2}$