Notes 2.2: Slope
This lesson will cover the competency of interpreting functions.
Using your book, define slope in 3 different ways:
Define positive slope, negative slope, zero slope, and undefined slope (draw a picture to go with
each):
Why are horizontal lines defined as zero slope and vertical lines as no slope?
Ex 1: Find the slope of the line passing through the following points:
a. (0, 3) (4, 8)
b. (-5,1)(5, -4)
c. (4,6) (4, -1)
d. (3, -2) (5, -2)
Slopes of Parallel and Perpendicular Lines
Two lines are parallel if ___________________________________.
Two lines are perpendicular if _____________________________.
Ex 2: Tell whether the lines are parallel, perpendicular, or neither.
a. Line 1: through (-2, 8) and (2, -4)
Line 2: through (-5, 1) and (-2, 2)
b. Line 1: through (-4, -2) and (1, 7)
Line 2: (-1, -4) and (3, 5)
Slope can also be called rate of change. This is a term most often used in word problems, science, and
higher math (like calculus).
Ex 3: Use the diagram, which illustrates the growth of a giant sequoia, to find the average rate of
change in the diameter of the sequoia over time. Then predict the sequoia’s diameter in 2065.
HW: pgs. 86-88 #1 – 47 odds