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  • 2010 December(69A) Math Question 19

    Algebraic & Function Expressions

    - Systems of Equations

    Choice D
    $$x + y = 21 $$ $$x – y = 15$$ $$\Rightarrow 2x=21+15=36$$ $$x=18$$ $$y=3$$ $$xy=18\times3=54$$

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