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Mathematics 8 Online
OpenStudy (anonymous):

Find an equation in standard form for the ellipse with the vertical major axis of length 18, and minor axis of length 16.

OpenStudy (mertsj):

Is the center at the origin?

OpenStudy (anonymous):

it does not specify

OpenStudy (mertsj):

Let us assume then that the center is the origin. If the major axis is 18, then a = 9 and a^2=81. If the minor axis is 16, then b = 8 and b^2=64. Now you can write the equation. Remember that this ellipse is vertical and so a^2 goes under y^2

OpenStudy (anonymous):

how do you know that the ellipse is vertical? @mertsj

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