SAT Math Practice Question #20670 - SATify | SATify

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SAT Math Practice Question #20670 - SATify | SATify

#20670

coordinate geometry

quadratic equations

hard

180 sec

In the $x y$ -plane, the graph of the equation $y = - 2 x^{2} + 10 x - 70$ intersects the line $y = c$ at exactly one point. What is the value of $c$ ?

A.

$- \frac{115}{2}$

B.

$- 70$

C.

$- 60$

D.

$- 55$