AlgebraMediumFunction value from one value and the y-intercept
Algebra practice question
The graph of the linear function g in the xy-plane has y-intercept 7, and g(−1) = 4. What is the value of g(2)?
Answer: 13
The slope is (7 − 4)/(0 − (−1)) = 3, so g(x) = 3x + 7 and g(2) = 6 + 7 = 13.
Common wrong answers
- If you answered 1
- 1 uses slope −3.
- If you answered 9
- 9 comes from 7 + 2, adding x instead of 3x.
- If you answered 10
- 10 adds the slope once to 7 instead of twice.
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