Also see the handouts on

• Partial Derivatives
• Implicit Differentation
• Limit Definition of Partial Derivatives

Page 911, problems:

• 1 – 7 odd,

• 10,    Answers:     f_x(2,1) ≈ +4,     f_y(2,1) ≈ −2

• 11 (give the interpretations, but don't do the plots)

• 15 – 27 odd,

• 31, 33,

• 41, 43,

• 47, 49,

• 53, 55, 63, 65, 67

• 74 a,b only
  Answers:
  1. negative
  2. positive

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