Question

Given that D(x) = 2x, select all of the following that are true statements.
D(x) is a function.
x is the dependent variable.
D(6) = 3
D(x) is a direct variation.
D(x) is a rule for the set of points (5, 10), (6, 12) and (-2, -4).

Answer 1

First one, true.
Third one, true.
Last one, true.
I am unsure about the fourth one, hang on.

Answer 2

It's also true.

Answer 3

The only false is the second one, because the dependent variable is y (y depends on x)