Suppose a circle is centered at the vertex (0, 0) and has a radius of length 7. a. For which points on the circle is the x-coordinate equal to 1? Your first answer should have a positive y-value. O (0,6.93) Preview O (0,-6.93) Preview b. For which points on the circle is the x-coordinate equal to 6? Your first answer should have a positive y-value. o (0,3.606) Preview O (0,-3.606) Preview c. What is the equation of the graph of the circle? x^2+y^2=49 Preview