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Which of the following has a constant of proportionality of 2? A) y = 2x B) y = x + 2 C) 2y = x D) y + 2 = 2x

2 Answers

6 votes

Answer: The answer is A. y=2x

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User Yogurt The Wise
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8.4k points
3 votes

The correct answer is A.


You have direct variation if x and y are modeled by the equation



y = mx


In this case, m is the constant of proportionality. So, if the constant has to be 2, the equation becomes



y = 2x


A side note: Actually, option C has a constant of proportionality of two as well, except the roles of x and y are interchanged. I chose option A because usually you want the y = mx form, but the names of the variables are obviously meaningless.

User Vasilyrud
by
8.3k points

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