How do you get more than 6 equations on your TI-84 Calculator, when in parametric mode?

I have a project for my Pre-Calculus class, and my teacher says she knows you can stimulate the parametric mode so that you can put in more than six equations, but she doesn't know how to do it. Does anyone know?

Well, the closest thing that could come to having more than six of those equation variables is to use lists. For example:
X1T = T
Y1T = T²
X2T = -T²
Y2T = -2T

could be condense to:
X1T = {T,-T²}
Y1T = {T²,-2T}

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