Question 1056911
Two choices for method:  Use the standard form directly, or use the definition of an ellipse.  Take your pick.  Standard form may be easier.


{{{(x-0)^2/a^2+(y-0)^2/b^2=1}}}


{{{x^2/a^2+y^2/b^2=1}}}


{{{system(4^2/a^2+3^2/b^2=1,(-1)^2/a^2+2^2/b^2=1)}}}