I need help figuring out what the A and B variables are. I am not sure why I am

Question

I need help figuring out what the A and B variables are. I am not sure why I am calculating this wrong....

In a student experiment, a constant-volume gas thermometer is calibrated in dry ice (-78.5degreeC) and in boiling ethyl alcohol (78degreeC). The separate pressures are 0.896 atm and 1.629 atm. Hint: Use the linear relationship P = A + BT, where A and B are constants. What value of absolute zero does the calibration yield? What pressure would be found at the freezing point of water? What pressure would be found at the boiling point of water? From the linear relationship, we know that the pressure is related to the temperature as P = A + BTC, where A and B are constants, and Tc is the Celsius temperature. To find A and B, we use the given data atm = A + (-78.5 degreeC)B and atm = A + (78degreeC)B. Solving these two equations simultaneously, we find A = Your response differs from the correct answer by more than 10%. Double check your calculations, atm and B = Times 10-3 atm/degreeC. Therefore, for all temperatures, P = atm + ( Times 10-3 atm/degreec)Tc.

Explanation / Answer

A-78.5B=0.896

and

A+78B=1.63

So

A=1.2641atm and B=4.69*10^-3 atm/C

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