AlgebraHardInput that gives a target output
Algebra practice question
The linear function f has slope −3 and f(2) = 11. For what value of x is f(x) = −4?
Answer: 7
f(x) = 11 − 3(x − 2). Setting 11 − 3(x − 2) = −4 gives 3(x − 2) = 15, so x = 7.
Common wrong answers
- If you answered 3
- 3 comes from a sign error, 11 − 3(x − 2) = 4.
- If you answered 5
- 5 is x − 2, not x.
- If you answered -3
- −3 is the slope.
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