Positive Slope y₂-y₁ x₂-x₁ m= = 4-0 3-1 = 2 4 = 2 There is a positive slope of 2 therefore the line rises from left to right.
7.
Negative Slope Let (x₁, y₁)= (0,3) and (x₂,y₂)=(4,1) Find m. y₂-y₁ x₂-x₁ m= = 1-3 4-0 = 4 -2 = -1 There is a negative slope of -1/2 therefore the line falls from left to right. 2
y₂-y₁ x₂-x₁ m= = 3-⁻1 5-5 = 0 4 = Undefined! The slope is undefined because division by 0 is undefined and the expression 4/0 has no meaning. This line is vertical and we can compare it to walking up a wall, impossible.
10.
Summary: Slope of Lines Positive- rises left to right Negative- falls left to right Zero- horizontal Undefined- vertical
The top of the ladder is 12ft from the ground. The base of the ladder is 5ft from the wall. What is the slope of the ladder?
Ladder rise 12 run 5 = 12ft 5ft
14.
Making Sense of Slope! A D C B E Choose different pairs of points on the line and find their slope. What do you notice? What conclusion can you draw?
15.
Making Sense of Slope! Anwsers mAB= mBC= mCD= mDE= 1 2 1 2 1 2 1 2 Now, based on the conclusion that the slope is ½ between each set of points, complete the sentence: No matter what pair of points you choose on a line, the ______ remains constant. *slope
16.
The Slope of the Road The slope of the road is the vertical rise divided by the horizontal run. If the vertical rise is 24 feet for a horizontal run of 1 mile, determine the slope of the road. *Hint- 1 mile=5280 feet 24ft 24ft 1 1mi 5280ft 220 = = *This means that for every 1ft that you move up, you also move 220ft forward.
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