I'm trying to get the coefficients of a 3rd order polynomila line of best fit equation. I am currently using the built in function in the graph and copying and pasting the values (have over 150+ best fit lines to retrieve coefficients from). I know that using LINEST would work, but I need to be able to force the y-intercept to zero, and I don't know how I would go about that. Thanks in advance for the help!