What is the solution set?

To solve the system of equations below, grace isolated the variable y in the first equation and then substituted into the second equation. what was the resulting equation? 3y=12x x^2/4+y^2/9=1

What percent of the circle below is shaded?

1yd 1 ft = 1 1/12 1 1/3 1 1/2 1 1/6