GCSE Maths Practice: direct-proportion

Question 8 of 10

Determine which pairs satisfy y ∝ x.

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\( \begin{array}{l}\text{If y ∝ x and y = 10 when x = 4, which pairs are true?}\end{array} \)

Select all correct options:

\( \text{When x = 8, y = 20} \) \( \text{When x = 2, y = 5} \) \( \text{When x = 6, y = 16} \) \( \text{When x = 10, y = 25} \)

Check constant of proportionality.

Calculate k and verify each pair.