Need help with the order of electric potential

[NasuSama]

Homework Statement

In the diagram below, there are two charges of $+q$ and $−q$ and six points (a through f) at various distances from the two charges.(See attachment) You will be asked to rank changes in the electric potential along paths between pairs of points.

Homework Equations

$V = \dfrac{kQ}{r}$ [Not sure if this is the correct form to use]

The Attempt at a Solution

I know the order of the point charges is

$B > A > C = D > F > E$

I believe the order of change of potential should be...

1. From c to b
2. From d to a
3. From c to d
4. From b to a and from f to e
5. From c to e

 

[mfb]

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$V = \dfrac{kQ}{r}$ [Not sure if this is the correct form to use]

That is the potential of a single charge, but you have two charges.