Question 763630
The ellipse pictured below is centered at the origin. The length of the horizontal axis is 18, and the length of its vertical axis is 8. What is the equation of the ellipse?
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Given ellipse has a horizontal major axis.
Its standard form of equation: {{{(x-h)^2/a^2+(y-k)^2/b^2=1}}}, a>b, (h,k)=(x,y) coordinates of center
2a=length of horizontal major axis=18
a=9
a^2=81
2b=length of vertical minor axis=8
b=4
b^2=16
equation:
 {{{x^2/81+y^2/16=1}}}