The slope of every horizontal line is… a. 0 b. 1 c. d. undefined user: what is the slope of the line that contains the points (–6, 3) and (4, –5)? a. –4 b. c. d.

Horizontal lines have a slope of 0, just as vertical lines have a slope that is undefined.

slope = (y2 - y1) / (x2 - x1)
(-6,3)(4,-5)
slope = (-5 -3) / (4 - (-6) = -8 / (4 + 6) = -8/10 reduces to - 4/5

It says in the questions that it is 6.5?