Thread: How to solve for unknowns ?

Here is the question , i tried to solve it using lns but didnt work out for me

Originally Posted by kaboose786

Here is the question , i tried to solve it using lns but didnt work out for me

, take the from both side,..



for constant, we have






from , we have


solve it.

for constant,. use the same method to find .

once you find and ,..you'll get .

so, using the data obtained from the three trials, you'll get three equations in a, b, c, which you can then solve by using Cramer's rule, Matrix method, or using a calculator.


2) Obviously the most accurate would be Linear Regression, (I think) but there is another method I can spot here.

For trials 1,2,3 and 4, the Pressure remains constant. Therefore, you can assume the the above equation as being only a function of volume.

So plot a graph of the 4 readings Vs

The slope of this graph gives you the value of b.


Now for trials 5,6,7 observe that the volume remains constant, hence plot the graph of

The slope of this graph would give you the value of c.

Now using c, and b obtained thus, you can estimate a.

Originally Posted by dedust

, take the from both side,..



for constant, we have






from , we have


solve it.

for constant,. use the same method to find .

once you find and ,..you'll get .

thanks a lot for replying am done part a with ur help .. appreciated