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.
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