Linear regression (matching exactly first (start) data point

[Querx76]

I would like to run a linear regression with 4 datapoints (let's say 1, 4, 5, 8). I would like that the line (for the Chart) starts at the value of the first data Point (here 1). How can I fit the regression, that it takes all four values into account, but the intercept (or first value is exactly the first data point). Any help for funcions in Excel would be very helpful. Many thank and best, Peter/Switzerland