Ellipses like thishave equations of this form with aČ under the term in x Ellipses like this have equations of this form with aČ under the term in y a is always greater than b, and of course aČ is greater than bČ. The center is (h,k), the semi-major axis is a, the semi minor axis is b. Since the denominator 81 is larger than the denominator 25, so we know this is an ellipse that looks like this By comparison h=5, k=9, aČ=81, bČ=25, and so a=9, b=5 So the center is (h,k) = (5,9). The major axis is 2a=18, and the minor axis is 2b=10, and the two axes bisect each other at the center (5,9), so we draw this: Edwin