The equation of a line in slope-intercept form is y = mx + b, where m is the slope and b is the y-intercept. Given the point (0, -2) and slope m = -2, we can plug these values into the equation:
y = -2x - 2
So, the equation of the line passing through the point (0, -2) with a slope of -2 is y = -2x - 2.