How do I quickly and easily interpolate a point on a chart without given data?

[usfz28]

I completely forgot how to do this. I have a thermo test coming up and i will be interpolating a lot of data. What is the fastes/easiest way to interpolate a point on a chart not given?

 

[berkeman]

Thread moved to math homework forum.

wikipedia.org should help you out: http://en.wikipedia.org/wiki/Interpolation

 

[usfz28]

yea already looked at that...The first eq. on this site is much easier but someitmes it does not work http://engineering.union.edu/~brunob/mer026/Thermo%20intro%20interpolation.doc

 

[whatta]

someitmes it does not work

when is that?

 

[symbolipoint]

Think of how the data would appear on a cartesian graph. Represent the two boundary points as a line. You only need simple elementary algebra about equations for a line to find the missing coordinate.