What is the awnser to y=-1

I've never been good at math he told he loves but he keeps cheating on me, so it ain't adding up sis

Plzzz i beg u so much asap ! what is the slope of this line? enter your answer in the box.

The lengths of nails produced in a factory are normally distributed with a mean of 4.91 centimeters and a standard deviation of 0.05 centimeters. find the two lengths that separate the top 4% and the bottom 4%. these lengths could serve as limits used to identify which nails should be rejected. round your answer to the nearest hundredth, if necessary.