PIYUSH L. answered • 06/04/14

Maths tutoring for middle school to college maths students

Hi Dalia,

You need to calculate dy/dx at (-3,-1)

Differentiating the given expression we get,

2*2(x^2+y^2)(2x+2y*dy/dx) = 25(2x-2y*dy/dx)

Substituting y and x as -3 and -1 respectively, we get

4(9+1)(-6-2*dy/dx) = 25(-6+2*dy/dx)

On solving we get,

dy/dx = -8/13

Dalia S.

06/04/14