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67f Math
Question 13
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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