General form of line equation could be written as
y = mx + b
m represents the slope of the line, and b represents the y-intercept
Given, y-intercept is -1, therefore
b = -1
Given, the slope of the line is -2, therefore
m = -2
Write the line equation
y = mx + b
y = -2x + (-1)
y = -2x - 1
The answer is third option