FORECAST.LINEAR(x, known_y's, known_x's)

Returns the future y-value along a linear trend using existing values.

xThe x-value you want the prediction for.
known_y'sThe set of y-values for the equation (y = mx + c).
known_x'sThe set of x-values for the equation (y = mx + c).


* Added in Excel 2016.
* This function replaces the FORECAST function.
* You can use the FORECAST.ETS function to return the future value based on historical values.
* You can use the FORECAST.ETS.CONFINT function to return the confidence interval for a future value.
* You can use the FORECAST.ETS.SEASONALITY function to return the length of the repetitive seasonality pattern.
* You can use the FORECAST.ETS.STAT function to return the statistical value for a future value.
* For an illustrated example refer to the page under Advanced Functions.
* For the Microsoft documentation refer to

1=FORECAST.LINEAR(30,{6,7,9,15,21},{20,28,31,38,40}) = 10.607
2=FORECAST.LINEAR(3.2,2,3) = #DIV/0!

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