I am trying to find out two unknown values from one equation

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.

I have Values for T and t but I don't know how to find the 2 unknowns in the 1 eqn

thanks ronL, in class we got the time and temperature which is:

t= 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14

T= 93 75 62 51 45 41 37 35 33 31 30 29 28 27.8 27

But even if I substitute those numbers in I still have two unknowns left, and I don't know what to do after I substitute T and t in.

Thank you for your help