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  • 2011 April(67F) Math Question 13

    Algebraic & Function Expressions

    - Systems of Equations

    Choice D
    $$x + y = 15 ---(1)$$ $$x – y = 9---(2)$$ $$(1)+(2)$$ $$2x=24$$ $$x=12$$ $$y=3$$ $$xy=12(3)=36$$

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