Algebra practice question

Answer: -1 or −1

From the first, y = 4x − 5. Substitute: x + 8x − 10 = 8, so 9x = 18, x = 2, y = 3. x − y = −1.

Common wrong answers

If you answered 1

1 is y − x, the difference the other way.

If you answered 2

2 is x alone.

If you answered 5

5 is x + y.

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