The Y= key and the Function Screen

  • Press the Y= key (circled in red) to see the Function Screen shown to the right.

    • NOTE: There may be some functions already entered on your screen - that doesn't matter now.

  • You can enter functions of one variable in the form y=f(x) by using the Variable Key (circled in green).

    • NOTE: The variable must be entered as x, even if some other letter is used for it.