Find the critical point set for the given system. dx dt dt = x-y 5x² +9y2²-8 SCOOP Find the critical point set. Select the correct choice below and, if necessary, fill in the answer box(es) to complete your choice. A. The critical point set consists of the line(s) described by the equation(s) (Use a comma to separate answers as needed. Type an ordered pair Type an exact answer, using radicals as needed.) B. The critical point set consists of the isolated point(s) (Use a comma to separate answers as needed. Type an ordered pair Type an exact answer, using radicals as needed.) C. The critical point set consists of the isolated point(s) and the line(s) described by the equation(s) (Use a comma to separate answers as needed. Type an ordered pair Type an exact answer, using radicals as needed.) D. There are no critical points.