16Hit1600
AlgebraEasy–MediumPoint of a given form on a line

Algebra practice question

The point (a, 3a) lies on the line 2x + y = 25 in the xy-plane. What is the value of a?

Answer: 5

2a + 3a = 25, so a = 5.

Common wrong answers

If you answered 25
25 copies the constant.
If you answered 12.5
12.5 uses only 2a = 25.
If you answered 8.33
8.33 uses only 3a = 25.

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