please answr questions 8-12 and show w.ork. will rate helpful!

4 8. (a) Determine the number of degrees the axis must be rotated to eliminate the xy-term of the conic x' + 6xy + y - 6 = 0. (b) Graph the conic in part (a) and use a graphing utility to confirm your result. (x + 2y' - 4x + 6y - 5 =0 9. Solve the system of equations at the right algebraically by the method of substitution. xty+5=0 Then verify your results by using a graphing utility. System for 9 In Exercises 10-12, sketch the curve represented by the parametric equations. Then eliminate the parameter and write the corresponding rectangular equation whose graph represents the curve. 10. x = 1 -6 11. x = v/-+ 2 12. x = 2 + 3 cos e Y= - 1 Y= y = 2 sin a