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Gradient and Direct Proportion - Questions

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Question 1
20485

\(X\) is directly proportional to \(a\). If when \(a = 6, X = 18\), what is the constant of proportionality in \(X = ka\)?

A.

\(k = \dfrac{1}{3}\)

B.

\(k=3\)

C.

\(k=108\)

D.

\(k = \dfrac{1}{108}\)

\(k=3\)

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