Algebra practice question

Answer: 2

Add the equations: 5x = 15, so x = 3. Then y = 7 − 6 = 1. x − y = 3 − 1 = 2.

Common wrong answers

If you answered 1

1 is y alone.

If you answered 3

3 is x alone.

If you answered 4

4 is x + y, the sum; the question asks for the difference.

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