Does anyone know how to find two unknown values in the one equation it is for a year twelve maths b assignment. I am trying to find out what c and k are in this equation (by the way c and k are constants):

T=TS + ce^(-kt)

Where TS= Temperature of surroundings which equals 23 degrees

T= Temperature of the body at a time (t)

t= Time

c & k= constants

Thank you for your help.