Temperature, tangents and contours

1. http://ift.tt/QCVyXV

2. gradT = 10i+8j

3. I can show the temperature is zero at point (1,-1) by just putting in x=1 and y=-1 to the function given in the image

Hi 🙂

I have no idea what to do for finding the equation of the tangent part. If someone could help, then that would be great.

Thanks

http://ift.tt/QCVBmx

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