A circle has the equation x + y+6x-4y - 23 = 0. (a) Find the center (h,k) and radius r of the circle. (b) Graph the circle. (c) Find the intercepts, if any, of the graph. (a) The center of the circle is (Type an ordered pair, using integers or decimals.) The radius of the circle is (Type an integer or a decimal.) (b) Use the graphing tool to graph the circle. Click to enlarge graph (c) What are the intercepts? Select the correct choice below and, if necessary, fill in the answer box to complete your choice. OA. The intercept(s) is/are (Type an ordered pair. Use a comma to separate answers as needed. Type exact answers for each coordinate, using radicals as needed. Simplify your answer.) OB. There is no intercept. -10 -8 www 8 6- 6