SAT Math Practice Question #28449 - SATify | SATify

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SAT Math Practice Question #28449 - SATify | SATify

#28449

algebra

systems

hard

120 sec

Integers $a, b, c$ satisfy $ab + c = - 1$ , $b c + a = 5$ , and $c a + b = 1$ . What is $ab + b c + c a$ ?

A.

8

B.

9

C.

11

D.

13

E.

15