Final answer:
The equation of a line with a slope of 1 and a y-intercept of -4 is y = x - 4.
Step-by-step explanation:
The equation of a line in slope-intercept form is y = mx + b, where m is the slope and b is the y-intercept. In this case, since the slope is not provided, we can assume the slope is 1. Therefore, the equation for a line with a slope of 1 and a y-intercept of -4 is y = x - 4 (Option C).
Learn more about Equation of a line in slope-intercept form