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 arule for the set of points ( 5, 10), ( 6, 12 )and ( -2, - 4 ).
