To figure out which equation represents a line with a zero slope, we need to look at the slope-intercept form of a line, which is . In this form, represents the slope and represents the -intercept.
A. For the equation :
This equation can be rewritten as . Here, the coefficient of (which is the slope ) is . So, this equation represents a line with a zero slope.
B. For the equation :
In this equation, the coefficient of is . Since