Answer
$\frac{x^2}{16}+\frac{y^2}{25}=1$
Work Step by Step
If we divide the equation by $400$, we obtain: $25x^2+16y^2=400\\
\frac{25x^2}{400}+\frac{16y^2}{400}=\frac{400}{400}\\
\frac{x^2}{16}+\frac{y^2}{25}=1$
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter 6 - Matrices and Determinants - Exercise Set 6.5 - Page 654: 78
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