Problem-Solving and Data AnalysisEasy–MediumIntercept of a fitted line from its slope and a point
Problem-Solving and Data Analysis practice question
The line of best fit for a scatterplot has a slope of 2 and passes through the point (3, 11). What is the y-intercept of the line?
Answer: 5
y = 2x + b, and 11 = 2(3) + b gives b = 5.
Common wrong answers
- If you answered 3
- 3 is the x-coordinate of the given point.
- If you answered 8
- 8 is 11 − 3, subtracting x rather than 2x.
- If you answered 17
- 17 is 11 + 6, adding 2 × 3 instead of subtracting it.
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