rate constant

Hej alle brugere herinde :) . jeg sidder med en opgae angående hastighedskonstant. Men hvordan løser jeg sådan en opgave ? Opgaven lyder såleddes:

The following data were collected for a reaction.
Rate constant (mol-1 L s-1)                                 Temperature (?C)
2,88 x 10-4                                                                  320
4,87 x 10-4                                                                  340
7,96 x 10-4                                                                  360
1,26 x 10-3                                                                  380
1,94 x 10-3                                                                  400

Determine the activation energy for the reaction in KJ mol-1 both graphically and by calculation using ln(k_2/k_1) =          -E_a/R (1/T_2 -1/T_1 ).? For the calculation of Ea, use the first and last rows of data in the table in this question.