We have to find out 2 unknowns, a and b. This is only possible if we have at least 2 equations. Do we have this?
Yes, because we know 2 combinations of p and T for which the equation works.
So, step 1: write down the equation that you get when you insert the values p1 and Tp1.
Step 2: write down the equation that you get when you insert the values p2 and Tp2.
Take a hard look at the equations.
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