AlgebraHardProduct of x and y from two equations
Algebra practice question
If 3x − 2y = 11 and x + 4y = 13, what is the value of xy?
Answer: 10
From the second, x = 13 − 4y; then 39 − 12y − 2y = 11 gives y = 2 and x = 5, so xy = 10.
Common wrong answers
- If you answered 3
- 3 is x − y.
- If you answered 7
- 7 is x + y.
- If you answered 2.5
- 2.5 is x/y.
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