Haster hjælp!!!!BRUG FOR HJÆLP

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.

Jeg har lavet en lineær graf, og har fået regressionsligning:

y=-0,0001x+0,0008

Ea=R*0,0001=8,31*10^-7 kJ mol^-1

vha. formlen har jeg fået den til 79,11 kJ mol^-1

Hvad har jeg gjort galt?