Algebra practice question

Answer: 6

From the second, y = 2x − 1. Substitute: 3x + 4(2x − 1) = 18, so 11x = 22, x = 2, y = 3. xy = 6.

Common wrong answers

If you answered 2

2 is x alone.

If you answered 3

3 is y alone.

If you answered 5

5 is x + y.

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