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AlgebraHardProduct of the solutions

Algebra practice question

If 2x + 3y = 11 and x − y = 3, what is the value of xy?

Answer: 4

From the second, x = y + 3. Substitute: 2y + 6 + 3y = 11, so 5y = 5, y = 1, x = 4. xy = 4.

Common wrong answers

If you answered 1
1 is y alone.
If you answered 3
3 is x − y, the given difference.
If you answered 5
5 is x + y.

More Algebra questions

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