AlgebraHardInput for a target output of a linear function
Algebra practice question
For the linear function g, g(x) = 3x − 7. For what value of x is g(x) equal to 20?
Answer: 9
3x − 7 = 20 gives 3x = 27, so x = 9.
Common wrong answers
- If you answered 27
- 27 stops at 3x = 27.
- If you answered 53
- 53 is g(20).
- If you answered 4.33
- 4.33 solves 3x = 13, subtracting 7 instead of adding.
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