Posted by **BOB** on Tuesday, November 15, 2011 at 9:32am.

an engineer designs a satellite dish with a parabolic cross section. The dish is 15 ft wide at the opening and the focus is placed 4 ft from the vertex. find an equation of the parabola.

I know how to work this problem, but how do I know that I use the equation y^2 = 4px instead of x^2 = 4py.

Please help this is so confusing!!!!

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