Now I Have a problem!
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).
+55 
