Find all real zeros of the function y=-9x-1

For zeros of the function (y is the function, a function of x) we need y = 0 so that in turn means we need - 9x - 1 = 0 or - 9x = 1 (i.e. add 1 to both sides); now divide by - 9, and x = 1/-9 which is exactly the same as - 1/9 or - (1/9) and this is the only zero of the function.

or   

If y = -9x - 1, 

When y = 0 
0 = -9x - 1 
0 + 1 = -9x - 1 + 1 
1 = -9x 
1/9 = -9x/9 
1/9 = -x 
1/[9 X (-1)] = -x/-1 
- (1/9) = x 

When x = 0 
y = (-9 X 0) - 1 
y = 0 - 1 
y = - 1