Question 893725
This is not a complete solution:


{{{(x-4)^2/a^2+(y-3)^2/b^2=1}}}, and {{{a/b=2}}}; and your given point on the ellipse (2,1) gives  {{{(2-4)^2/a^2+(1-3)^2/b^2=1}}}; you should be able to solve for a and b.


Solve this system:


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