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The expression xy + 7e^y = 7e relates x and y. At the point x = 0, to determine the value of y, substitute 0 for x in xy + 7e^y = 7e
=> 0*y + 7*e^y = 7e
=> 7*e^y = 7e
=> e^y = e
=> y = 1
If xy + 7e^y = 7e, when x = 0, y = 1.
that doesnt answer the question. hence the y'' not y.
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