CHAPTER 2

Subtracting the second from the first partial derivative expression, we obtain. 4X - 6Y + 4 = 0. Multiplying the last partial derivative expression (i.e., LAC/ ) by 4 and subtracting it from the expression he has just obtained above, he gets: 33 Chapter 02 5/5/03 2:57 PM Page 33 4X - 6Y + 4 = 0 4X + 4Y - … ................
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