Question 849799
1. Write an equation of an ellipse in standard form with the center at the origin and with the given characteristics. 
Vertex at (-5,0) and co-vertex at (0,4)
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ellipse has a horizontal major axis
its standard form of equation: {{{(x-h)^2/b^2+(y-k)^2/b^2=1}}}, a>b, (h,k)=center
center: (0,0)
a=5
a^2=25
b=4
b^2=16
equation: {{{x^2/25+y^2/16=1}}}