Apparent resistance of a MOSFET?

Hello, I'm stuck on a homework problem where they ask us to determine the apparent resistance of a MOSFET given a set of data plotting V_DS (voltage from drain to source) against V_GS (voltage from gain to source). I don't really have any idea how to do it. In addition to the data, we're given the circuit. Any help is much appreciated, thanks.

Simple ohms law. Given Vdd, Vr, and Rload, figure current through load resistor and Vds. Rs of MOSFET equals Vds/Id.

Oh, that makes sense. Thank you.
Now, I have one more, very similar question that I can't quite finish...

From this, I have gotten three unique equations:
[LATEX]V_R = I_LR_L=V_d_dR_L/(R_L + R_E)[/LATEX]
[LATEX]V_D_S = I_LR_E=V_d_dR_E/(R_L + R_E)[/LATEX]
[LATEX]I_L =V_d_d/(R_L + R_E)[/LATEX]
(which is the same as the fourth)
[LATEX]R_E=V_d_d/I_L - R_L[/LATEX]

We're given [LATEX]V_d_d = 6V[/LATEX] and [LATEX]R_L = 200Ω[/LATEX] but we need to find four unknowns [LATEX]V_R, V_D_S, I_L, R_E[/LATEX] so I can't figure out a fourth equation... Any ideas are greatly appreciated. thank you

Need another value. Ids (or load IL) Which will be a function of Vgs for the particular MOSFET.