1. Eliminate the parameter to find a Cartesian equation of the curve with parametric equations:

x=7cos(theta)

y=5sin(theta)

0 less than or equal to (theta) less than or equal to 2 pi

I have no idea how to do this. I did what I thought was right. I have (theta)=arccos(x/7) and substituted that for theta in the y but it isn't right.

2. Find parametric equations for the path of a particle that moves clockwise once around the circle:

x^2 + (y-3)^2 = 4, starting at (2, 3).