PROBLEM:

What is the constant of variation if y varies directly as x and y = 24 when x = 8?

• A. 8
• B. 6
• C. 4
• D. 3

ANSWER: Choice D is the correct answer, the constant of variation is 3.

SOLUTION:

» The variation of numbers is directly proportional. So the equation of variation is:

» Given y = 24 when x = 8, solve for the constant of variation k.

Therefore, the constant of variation is 3. The correct answer is choice D.

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