The Formula element 
shows the graphs of a function, its inverse, or a parametric curve. The function or functions are defined by column formulas.
shows the graphs of a function, its inverse, or a parametric curve. The function or functions are defined by column formulas.|
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y = f(x): To plot a function of a single argument across the values of its single argument, drag the column that contains the formula to the Y zone and the column that contains the values of its single argument to the X zone. Make sure that the Response Axis is set to Auto or Y.
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x = f(t) and y = g(t): To plot the parametric curve defined by two functions, drag one to the X zone and the other to the Y zone.
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For an example illustrating the Formula element, see Example Using a Formula in Graph Builder Examples.
Note: These options do not apply to variables in the Overlay, Group X, Group Y, Wrap, or Page zones.
Tip: If you have multiple graphs, you can color or size each graph by different variables. Drag a second variable to the Color or Size zone, and drop it in a corner. In the Variables option, select the specific color or size variable to apply to each graph.