How can I change the variable letters in a trendline equation?

Right now my equations reads: f(x) = 3.11x + 0.038, however I need to change f(x) and x to different variables. This is in the Calc Spreadsheet.

I believe the asker wants to do something like change the equation to “g(t) = 3.11t + 0.038” instead.

See: Trend Lines

Default equation uses x for abscissa variable, and f(x) for ordinate variable. To change these names, select the trend line, choose Format - Format Selection – Type and enter names in X Variable Name and Y Variable Name edit boxes.

In a spreadsheet F(x) and x refer to cells. Thus, if you change the cells the values will change.

A1, 2, 3, 4, 5,… contains the x values
B1, 2, 3, 4, 5,… contains the F(x) values, which means for the first row B1 contains “=3.11*A1+0.038”
Now you can replace the A1, 2, 3, 4, … with other cells and can place the related formula into other cells as well.