Question #105148
Show that the complete integral of z = px +qy - 2p - 3q represent all possible planes through the points (2, 3, 0)
1
Expert's answer
2020-03-12T12:39:05-0400

Given that

z=px+qy2p3q                    (1)z=px+qy-2p-3q\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ (1)

Its complete integral is


z=ax+by2a3b                    (2)z=ax+by-2a-3b\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ (2)


a,ba, b being arbitrary constants.

Differentiating (2)(2) partially with respect to xx


zx=a=>p=a{\partial z \over \partial x}=a=>p=a

Differentiating (2)(2) partially with respect to yy


zy=b=>q=b{\partial z \over \partial y}=b=>q=b

Substituting in (2)(2) we get


z=px+qy2p3qz=px+qy-2p-3q

The equation (2)(2) is a linear equation in x,y,z.x,y,z. Hence it represents planes for various values of 𝑎 and 𝑏.  Substitute x=2,y=3,z=0x=2, y=3, z=0


2a+3b2a3b=0=>0=02a+3b-2a-3b=0=>0=0

The coordinates of the point (2, 3, 0) satisfy the equation (2).(2). Hence the complete integral (2)(2) of (1)(1) represents all possible planes passing through the point (2, 3, 0).


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