11. Solve: xp2-2yp + ax = 0 where p = dy dx 12. Solve: d2y dy...

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11. Solve: xp2-2yp + ax = 0 where p = dy dx 12. Solve: d2y dy - 2- dx -+y=xe dx 13. Solve: x2 dx dy + y = log x 2 dx dx 14. Transform the equation x-2xy + y+x-3y=0 to axes through the point (-1,0) parallel to the lines bisecting the angles between the original axes. 15. Find the center, length of axes and the eccentricity of the ellipse 2x+3y-4x-12y+13=0 11. Solve: xp2-2yp + ax = 0 where p = dy dx 12. Solve: d2y dy - 2- dx -+y=xe dx 13. Solve: x2 dx dy + y = log x 2 dx dx 14. Transform the equation x-2xy + y+x-3y=0 to axes through the point (-1,0) parallel to the lines bisecting the angles between the original axes. 15. Find the center, length of axes and the eccentricity of the ellipse 2x+3y-4x-12y+13=0