hi, basicaly i have lets say an y axis with 1-100 and a y value of 16-36
i need to use y value of 20 and go across to the trendline and find what the value of x is.
thanks in advance
You can use formula to calculate the value based on the component parts of the formula.
See here for more details
http://people.stfx.ca/bliengme/ExcelTips/Polynomial.htm
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