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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