Algebra practice question

Answer: 5

P: set y = 0, 3x = 12, so P = (4, 0). Q: set x = 0, −4y = 12, so Q = (0, −3). Distance: √(4² + 3²) = 5.

Common wrong answers

If you answered 1

1 is 4 − 3; lengths in a right triangle don't subtract.

If you answered 7

7 is 4 + 3, adding the intercepts' distances from the origin instead of using the Pythagorean theorem.

If you answered 25

25 is 4² + 3²; take the square root.

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