Find the constant of proportionality k, and write the linear function relating the two variables.Suppose that y varies directly with x. When x = 0.5, then y = 2.

A. k = 0.5; y = 0.5x
B. k = 0.25; y = 0.25x
C. k = 4; y = 4x
D. k = 1.5; y = x + 1.5


Answer: C

Mathematics

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