Points $A$ and $B$ have the same $y$-coordinate of 13, but different $x$-coordinates. What is the sum of the slope and the $y$-intercept of the line containing both points?
Let A = (m, 13) Let B = (n, 13)
Since the y coordinates are the same, the slope = 0 and the y intercept = 13
So...... the sum of the slope and y intercept is just 13