Volume, mL - 32.7 35.3 37.8 39.0 40.0
Temperature, C - 21 44 67 81 97

Plot V vs Temperature. - I think this line going to be straight line(right?).

I need to find equation of that line.

how can I find equation of that line? Thanks

The line using these data is not perfectly linear. You can fit a straight line approximation using regression techniques - are you familiar with how to do this? If not... I suggest you plot the poimnts like you were asked, and fit a straight line as best you can "by eye," then determine the equation of that straight line. The way to do that is to use:


\frac { V - V_1} { T - T_1} = \frac {\Delta V} { \Delta T}


where ( T_1,V_1 ) is any point on the line and \Delta V / \Delta T is the slope of the line. You can then rearange to get V as a function of T.