i just want to check my answers...coz i don't have an answer key to compare with....(adsbygoogle = window.adsbygoogle || []).push({});

1) y^2-3xy+x^2=7

y'=3y-2x/2y-3x

2) x^2+y^2=2xy

y'=1

3) 2x^2+xy+3y^2=0

y'=-4x-y/x+6y

4) 5x^2-2xy+7y^2=0

y'=y-5x/7y-x

5) 7x^2+6xy+9y^2=0

y'=-7x-3y/3x+9y

6) Find the equation of the tangent line to the graph of x^2+2y^2=3 at (1,1)

ans: x+2y-3=0

7) Find the equation of the tangent line to the graph of x^2+3y^2=4 at (1,1)

ans: x+3y-4=0

are those correct?

Thanks for your time

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Find the equation of the tangent line to the graph

**Physics Forums | Science Articles, Homework Help, Discussion**