SOLUTION: Determine an equation for the parabola with focus (3,1) and directrix x=9

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Question 922281: Determine an equation for the parabola with focus (3,1) and directrix x=9
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
Use the distance formula and the definition of a parabola; and then simplify the equation.

A variable set of points is (x,y), and the directrix is another variable set of points, (9,y). The focus is the one specific given point (3,1). Drawing a picture of this all may help.

Skipping most of the descriptive explanation,...
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If you understand that initial equation, then great! You are understanding. Now, just simplify it.