Graphing modes define the graphing parameters.
FUNCTION graphing mode plots functions, where Y is a function of X.
PARAMETRIC graphing mode plots relations, where X and Y are functions of T.
POLAR graphing mode plots functions, where r is a function of q.
SEQUENCE graphing mode plots sequences. Three sequences are available: u, v, and w, with an option of the independent variables of n, n+1, and n+2.