ACT 2010 December(69A) Math Question 19 Explanation - ACT Helper

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2010 December(69A) Math Question 19
Algebraic & Function Expressions
- Systems of Equations
Choice D
$x + y = 21$ $x - y = 15$ $\Rightarrow 2 x = 21 + 15 = 36$ $x = 18$ $y = 3$ $x y = 18 \times 3 = 54$
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