If the sum of two numbers is 5 and their difference is 2, what is their product? This problem is for extra points.
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Originally Posted by Schatzle06 If the sum of two numbers is 5 and their difference is 2, what is their product? This problem is for extra points. We have, $\displaystyle x+y=5$ $\displaystyle x-y=2$ Add, $\displaystyle 2x=7$ $\displaystyle x=3.5$ Substitute into first equation, $\displaystyle 3.5-y=2$ $\displaystyle y=1.5$ Thus, $\displaystyle xy=(1.5)(3.5)$
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