Answer
$\frac{x^2}{100}+\frac{y^2}{36}=1$
Work Step by Step
Step 1. With the given conditions, we have $2a=20, a=10\ yd$ (horizontal), and $b=6\ yd$
Step 2. The center is at $(0,0)$, so we can write the equation as $\frac{x^2}{100}+\frac{y^2}{36}=1$
