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I want to know how I can programmatic use my linear interpolate equation without having the user or myself to use the Goal Seek function in the data menu, well I could use the function but I want it to be "hidden" and just update the cell when the user is finished writing the required number in the other fields.

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The functions you're looking for are SLOPE and INTERCEPT, to determine the coefficient of, well, slope and intercept of the fitting line.

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