Problem-Solving and Data AnalysisEasy–MediumConstant of proportionality from a table
Problem-Solving and Data Analysis practice question
x | y
2 | 10
4 | 20
6 | 30
The values in the table satisfy y = kx for some constant k. What is the value of k?
Answer: 5
Use any row: 10 = k(2), so k = 5. Check: 5 × 4 = 20 and 5 × 6 = 30.
Common wrong answers
- If you answered 8
- 8 is 10 − 2, subtracting instead of dividing.
- If you answered 10
- 10 is y when x = 2, not the constant; k = y/x = 5.
- If you answered 0.2
- 0.2 is x/y, the ratio upside down.
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