Riley, I think we've been too explicit with each other. We should try to be more implicit. {{CMD_7}} I. Um. Don't really{{CMD_8}} {{CMD_9}} I mean when plotting things! {{CMD_10}} Okay, but I still have no idea what you are talking about. {{CMD_11}} Remember when we first learned the equation of a line, and the ``standard form'' was {{MATH_12}} or something, which is totally useless for graphing. Also a circle is {{MATH_13}} or something, and here {{MATH_14}} isn't even a function of {{MATH_15}}. {{CMD_16}} Ah, I'm starting to remember. We can write the same thing in two ways. For example, if you write {{MATH_17}} then {{MATH_18}} is {{{CMD_19}} explicity} a function of {{MATH_20}} but if you write {{MATH_21}} then {{MATH_22}} is {{{CMD_23}} implicitly} a function of {{MATH_24}}. {{CMD_25}} What I'm trying to say is that we need to learn how to work with these ``implicit'' functions. {{CMD_26}}