The equation you are trying to fit the data (ie slope) to is the called the Arrhenius equation, which is used to calculate kinetic rates at different temperatures given the parameter Ea and a reference rate.:

Taking the Arrhenius equation (see Wikipedia), we can manipulate it into this form:

ln(k) = -Ea/R * 1/T + ln(A)

which should get you 3 steps closer to answering the problem. Hope this helps.