Write the Equation of the Ellipse That Has Its Center $\frac { x ^ { 2 } } { 80 } + \frac { y ^ { 2 } } { 81 } = 1$

Multiple Choice

Write the equation of the ellipse that has its center at the origin, focus at (1, 0) and vertex at (9, 0) .

A) $\frac { x ^ { 2 } } { 80 } + \frac { y ^ { 2 } } { 81 } = 1$
B) $\frac { x ^ { 2 } } { 1 } + \frac { y ^ { 2 } } { 9 } = 1$
C) $\frac { x ^ { 2 } } { 81 } + \frac { y ^ { 2 } } { 80 } = - 1$
D) $\frac { x ^ { 2 } } { 81 } - \frac { y ^ { 2 } } { 80 } = 1$
E) $\frac { x ^ { 2 } } { 81 } + \frac { y ^ { 2 } } { 80 } = 1$