Question:

Given that D(x) = 2x, what are true statements?

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1. D(x) is a function.

2. x is the dependent variable.

3. D(6) = 3

4. D(x) is a direct variation.

5. D(x) is a rule for the set of points (5, 10), (6, 12) and (-2, -4).

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  1. 1. D(x) is a function.

    4. D(x) is a direct variation.

    5. D(x) is a rule for the set of points (5, 10), (6, 12) and (-2, -4).


  2. 1,2, and 5 are definitely true.  3 is not.  Not sure about 4.

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