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

For D (x) = 2 x:
- x is the independent variable,
- D ( 6 ) = 2 · 6 = 12.
10 = 2 · 5,     12 = 2 · 9,     - 4 = 2 · ( - 2 ).
True statements are:
A ) D ( x ) is a function.
D ) D ( x ) is a direct variation.
E ) D ( x ) is a rule for the set of points ( 5, 10), ( 6, 12 ) and ( -2, - 4 ).
 

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