SHM, Determing Spring Constant from Period^2 vs. Mass

[nmacholl]

Help!

I'm trying to find the spring constant (k) of a spring using simple harmonic motion. I have a graph of Period^2 vs. Mass.

Knowing that T=2*\pi*\sqrt{m/k}

How would one find k from the slope of this graph?
My linear fit yields: y=5.237x+0.003
5.237 being my slope

[G01]

HINT: Using what you know can you get an Equations for T^2 in terms of mass? If so, the slope of that equation is 5.237.