What would the slope of the force between 2 charged particles vs 1/r^2 give me?

[dannolul]

Homework Statement

A lab was performed by taking 2 charged particles at varying distances and measuring the force between them. (Dry data, and a graph of Fe vs 1/r^2 have been given.) Assume the charges are equal of magnitude. using the slope of the line and the value of coulomb's constant constant, calculate for the charge on one particle

Relevant Equations

Fe=(kq1q2)/(r^2)

I can get the slope of the line, but then I dont know what the slope is (units or whatever it is) then i get lost from there.

 

[Ibix]

What did you plot on the $y$ axis and in what units? What did you plot on the $x$ axis and in what units? If the gradient of a $y$-versus-$x$ plot is $\Delta y/\Delta x$ then can you determine the units in this case?