Question

What is the y intercept of f(x)= -2x - 1

Answer 1

The y-intercept of 

f(x) = -2x - 1

is  y = -1 .

Answer 2

This function is in slope-intercept form, which uses the following formula:

$y = mx + b$

m is the slope, and b is the y-intercept of the line.

In f(x) = -2x - 1, the slope is 2, and the y-intercept is -1, or (0, -1).