Question

,..

Answer 1

@LoveSpiderz

Answer 2

Is it written like this? \[f(y)=\frac{ y+7 }{ y ^{2}-7y }\]

Answer 3

y(y-7) can't be zero
y can't be 0 or 7

Answer 4

so domain is R - {0,7}

Answer 5

where R is set of all real numbers

Answer 6

nope it's not, in interval notation it'll be
(-infinity, 0) union (0,7) union (7, infinity)