In Problems 53–60, does the equation specify a function with independent variable x? If so, find the domain of the function. If not, find a value of x to which there corresponds more than one value of y.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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I need help with #55 and #56,  can you explain each question and what they mean? I just don't understand what to do.

 

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In Problems 53–60, does the equation specify a function with
independent variable x? If so, find the domain of the function. If
not, find a value of x to which there corresponds more than one
value of y.
53. 2х + 5у %3D 10
54. 6x – 7y = 21
55. y(x + y) = 4
56. x(х + у) %3 4
Transcribed Image Text:In Problems 53–60, does the equation specify a function with independent variable x? If so, find the domain of the function. If not, find a value of x to which there corresponds more than one value of y. 53. 2х + 5у %3D 10 54. 6x – 7y = 21 55. y(x + y) = 4 56. x(х + у) %3 4
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