X and Y avlue on scatter plot

hi,
let me know how to calculate the extrapolite the value on linear graph? i m able to calculate the x and y at 0, but i wanted to know if the value at 20.9.linear.xlsx

The chart is not going to do it automatically for you.

If this were me, I would use the LINEST() function to get the slope and intercept for my function (y=mx+b). Then you can use this formula in the spreadsheet to calculate y at whatever x you want.

thnx for ur reply.
can u pls make this in the excel sheet? i m so week in maths and excel plsss