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I have a TI-83+ SE. I have gotten the formula for the path of a projectile without air-resistance. It is:

y= ((Voy)/(Vox))X)-(g/(2(Vox^2)X^2)))

Now, I have a question. How do I program it to make it graph the parabola that I am supposed to get, and how can I get it to find me undefined variables (I have a basic grasp of programming, though this is beyond my league).

Any help would be greatly appreciated, thanks.