ln Problems 9- 14, assume that x=x(t) and y=y(t). Find theindicated rate, given the other information.

9. y=x^2+2; dx/dt= 3 when x= 5; find dy/dt

11. x^2+y^2 = 1 ;dy/dt= - 4 whenx=-0.6 andy= 0.8;

finddx/ dt

13. x^2+3.xy+y^2=11 ; dx/dt=2 when x=1 and y = 2; finddy/dt