Question

1. 25x2 + 9y2 = 225

Answer 1

whats your question

Answer 2

divide by 225 and write as
\[\frac{x^2}{9}+\frac{y^2}{25}=1\] which is in the form
\[\frac{x^2}{a^2}+\frac{y^2}{b^2}=1\] an ellipse with center at the origin