Double Interpolation thermodynamics

[axcelenator]

For Refrigerant 134a at T = 60C and v = 0.072 m3/kg,
determine pressure in kPa.

the v is in superheated region so I have a mini table look like in the picture I've added
there I need to do a double interpolation but don't know how. the anser for p is: 3.63Kpa.
Thanks

 

[LawrenceC]

Here is an explanation: http://www.eng.auburn.edu/users/dmckwski/engr2010/interpolate.pdf