AlgebraMediumA number from two descriptions
Algebra practice question
Seven less than three times a number equals two more than twice the number. What is the number?
Answer: 9
3n − 7 = 2n + 2, so n = 9.
Common wrong answers
- If you answered 5
- 5 comes from 3n − 7 = 2n + 2 solved as n = 7 − 2, subtracting the constants in the wrong order.
- If you answered -5
- −5 comes from moving the constants with the wrong signs.
- If you answered 1.8
- 1.8 comes from 5n = 9, adding 2n instead of subtracting.
More Algebra questions
- Medium
A system: 2x + y = 11 and x − y = 1. What is the value of x + y? - Medium
Which of the following describes all solutions to 4x − 9 ≤ 2x + 5? - Medium
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If y = 2x − 1 and 3x + y = 14, what is the value of x? - Medium
If |2x − 3| = 7, what is the sum of all possible values of x? - Medium
Line k has equation y = (2/3)x + 1. Which equation represents a line perpendicular to line k?
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