Question

Line AB contains points A (8, −4) and B (1, −5). The slope of line AB is

Answer 1

To find the slope of line AB, you would have to use the slope formula.
Slope = (y2 - y1) / (x2 - x1)
(8,-4)...x1 = 8 and y1 = -4
(1,-5)..x2 = 1 and y2 = -5
now we sub
slope = (-5 - (-4) / (1 - 8)
slope = (-5 + 4) / -7
slope = -1/-7
slope = 1/7

Therefore, the slope of line AB is 1/7

Answer 2

Be sure that when you are doing problems like this one, you pay attention to your signs. This is very important.

Answer 3

yes, k = dy/dx= 1/7 = 0.1429

http://www.hackmath.net/en/calculator/line-slope?x0=8&y0=-4&x1=1&y1=-5&submit=Solve