1. ## Parametric Help

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).

2. What did you get?. This?.

$y=5sin(cos^{-1}(x/7))=\frac{5\sqrt{49-x^{2}}}{7}$

3. How'd you get the 5*square root from the sin(arccos)?

I got 5sin(arccos(x/7)).

I mean I did the triangle, with sides x, 7, and Square root of 49-x^2.