Let L1 be the line containing points (8, -4) and (2, -5), and let L2 be the line containing points (10, 9) and (15, -21). Find the slope of each line.

Line 1
Points : (8,-4) and (2,-5)

To find the slope:
M = (y - y) / (x - x)
M = (-4 - -5) / (8 - 2)
M = (-4 + 5) / 6
M = 1 / 6 (answer)

Line 2

Points: (10, 9) and (15, -21)

M = (y - y) / (x - x)
M = (9 + 21) / (10 - 15)
M = 30 / -5
M = -30/5 (reduce this)
M= -6 (answer)