A relation or equation may or may not represent a function.
The equation defines y as a function of x
The equation given as:
[tex]xy + 5y = 4[/tex]
Factor out y
[tex]y(x + 5) = 4\\\\\\[/tex]
Divide both sides by [tex]x + 5[/tex]
[tex]y = \frac{4}{x + 5}[/tex]
Because y can be made the subject of formula of [tex]xy + 5y = 4[/tex], then it means that: y is a function of x.
Hence, the correct statement is (a) Yes
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