lesson 5-1 rate of change and slope sept. 8, 2014
TRANSCRIPT
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Lesson 5-1Rate of Change and Slope
Sept. 8, 2014
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Daily Learning Target
• I will find rates of change from tables
• I will calculate slope.
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Slope is a measure ofSteepness.
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Types of Slope
PositiveNegative
Zero
Undefinedor
No Slope
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Slope is sometimesreferred to as the“rate of change”
between 2 points.
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The letter “m” isused to represent
slope.
Why?
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If given 2 points on a line, you may findthe slope using theformula y2 – y1
x2 – x1m =
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The formula may sometimes be written
as m =∆y . ∆x
What is ∆ ?
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Find the slope of the line through the
points (3,7) and (5, 19).x1 y1 x2 y2
m = 19 – 7
5 – 3 m = 12 2
m = 6
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(3, 4) and (-6, -2)
-2 – 4 -6 – 3 m = -6 -9
m = ⅔
m=
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Example 1
Time (min) Distance (ft)
1 260
2 520
3 780
4 1040
The following table shows the distance a band marches over time. Is the rate of change in distance with respect to time constant? What does the rate of change represent?
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What if thenumerator is 0?
What if thedenominator is 0?
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If given the graphof a line, find the
slope by using the“triangle” method to
find the rise over run.
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rise = 4
run = 5
m= rise
run
m= 4/5
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Homework
• Workbook
• page 139 problems 1, 3, 5, 6, 8, 12, 13, 15
• Page 141 1-6 ALL