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ACT® Math

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Moderate

Factoring and Substitution

ACTMAT-NYRX4C

If $ x - y = 4 $ and $ { x }^{ 2 }-{ y }^{ 2 }=8 $, then $ xy = ? $

A

$6$

B

$-3$

C

$32$

D

$-6$

E

$3$