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## Homework Statement

I just got started on this, and am not grasping the WHOLE idea.

1.xy=25 The answer says -y/x

2.x^2+3xy+y^2=15 And this says -y^2/x^2

## Homework Equations

1. dy/dx(xy)= dy/dx(25)

1=0 ???

2.dy/dx x^2+3xy+y^2= dy/dx 15

2x+3+y(dy/dx) =0

## The Attempt at a Solution

2. -2x-3/y (which i know is not right.)