Question 677312
You can't divide by zero.


So y^2 - 7y can't be zero


if it were, then


y^2 - 7y = 0


y(y - 7) = 0


y = 0 or y-7 = 0


y = 0 or y = 7


So if y = 0 or y = 7, then the denominator is zero.


So we must exclude these values from the domain.


Answer:


Domain: The set of all real numbers but y can't be equal to 0 or y can't be equal to 7.