Choose the correct equations for the graphs when [[$ x $]] gets positive values.


A: [[$ y = x + 2 $]]
B: [[$ y = x - 2 $]]
C: [[$ y = 2x $]]
D: [[$ y = 2x^2 $]]
E: [[$ y = -2x^2 $]]
F: [[$ y = \displaystyle\frac {2} {x} $]]

a) The equation of the graph is A B C D E F

b) The equation of the graph is A B C D E F

c) The equation of the graph is A B C D E F