Chapter 1 8 Essential Question Essential Question What
- Slides: 42
Chapter 1 -8
Essential Question
Essential Question What is a line of symmetry?
Topic Interpreting graphs of function including intercepts, positive, negative, increasing, decreasing, extrema, and end behavior
Definitions Intercepts – where the graph crosses the x and y axis
Definitions Intercepts – where the graph crosses the x and y axis Line of symmetry – if each half of the graph matches the other half when folded on a line
Definitions Intercepts – where the graph crosses the x and y axis Line of symmetry – if each half of the graph matches the other half when folded on a line Positive – graph above the x-axis
Definitions Intercepts – where the graph crosses the x and y axis Line of symmetry – if each half of the graph matches the other half when folded on a line Positive – graph above the x-axis Negative – graph below the y-axis
Definitions Intercepts – where the graph crosses the x and y axis Line of symmetry – if each half of the graph matches the other half when folded on a line Positive – graph above the x-axis Negative – graph below the y-axis Increasing – from left to right the graph is going up
Definitions Intercepts – where the graph crosses the x and y axis Line of symmetry – if each half of the graph matches the other half when folded on a line Positive – graph above the x-axis Negative – graph below the y-axis Increasing – from left to right the graph is going up Decreasing – from left to right the graph is going down
Cont. Extrema Relative minimum – the lowest point on the graph
Cont. Extrema Relative minimum – the lowest point on the graph Relative maximum – the highest point on the graph
Cont. Extrema Relative minimum – the lowest point on the graph Relative maximum – the highest point on the graph End Behavior Sketch negative odd function – as x increases, y decreases and as x decreases, y increases
Cont. Extrema Relative minimum – the lowest point on the graph Relative maximum – the highest point on the graph End Behavior Sketch negative odd function – as x increases, y decreases and as x decreases, y increases Sketch negative even function – as x increases, y decreases and as x decreases, y decreases
Ex. 1 The graph shows the cost at a community college y as a function of the number of credit hours taken, x. Identify the functions as linear or nonlinear. Then estimate and interpret the intercepts of the graph.
Ex. 1 The graph shows the cost at a community college y as a function of the number of credit hours taken, x. Identify the functions as linear or nonlinear. Then estimate and interpret the intercepts of the graph. No x intercept; y intercept is at 50
Ex. 2 The graph shows the outbreak of the H 1 N 1 virus. Estimate and interpret where the function is positive, negative, increasing, decreasing, the x coordinate of any relative extrema and end behavior.
Ex. 2 cont. Positive – for x between 0 and 42
Ex. 2 cont. Positive – for x between 0 and 42 Negative – none
Ex. 2 cont. Positive – for x between 0 and 42 Negative – none Increasing – for x between 0 and 42
Ex. 2 cont. Positive – for x between 0 and 42 Negative – none Increasing – for x between 0 and 42 Decreasing – none
Ex. 2 cont. Positive – for x between 0 and 42 Negative – none Increasing – for x between 0 and 42 Decreasing – none Relative maximum – x = 42
Ex. 2 cont. Positive – for x between 0 and 42 Negative – none Increasing – for x between 0 and 42 Decreasing – none Relative maximum – x = 42 Relative minimum – x = 0
Ex. 2 cont. Positive – for x between 0 and 42 Negative – none Increasing – for x between 0 and 42 Decreasing – none Relative maximum – x = 42 Relative minimum – x = 0 End behavior – as x increases, y approaches 12000
Ex. 3 This graph shows price variations on stock prices. Determine where the graph is positive, negative, increasing, decreasing, extrema, and end behavior.
Ex. 3 cont. Positive – x value 5 and greater
Ex. 3 cont. Positive – x value 5 and greater Negative – x value between 0 and 5
Ex. 3 cont. Positive – x value 5 and greater Negative – x value between 0 and 5 Increasing – x greater than 3
Ex. 3 cont. Positive – x value 5 and greater Negative – x value between 0 and 5 Increasing – x greater than 3 Decreasing – x between 0 and 3
Ex. 3 cont. Positive – x value 5 and greater Negative – x value between 0 and 5 Increasing – x greater than 3 Decreasing – x between 0 and 3 Relative maximum – x = 6
Ex. 3 cont. Positive – x value 5 and greater Negative – x value between 0 and 5 Increasing – x greater than 3 Decreasing – x between 0 and 3 Relative maximum – x = 6 Relative minimum – x = 3
Ex. 4 The graph shows the area y in square centimeters of a rectangle with perimeter 20 centimeters and width x centimeters. Describe and interpret any symmetry in the graph.
Ex. 4 cont. Relative maximum – x = 5
Ex. 4 cont. Relative maximum – x = 5 Symmetric with left half mirror image of the right half
Ex. 4 cont. Relative maximum – x = 5 Symmetric with left half mirror image of the right half Symmetry tells you that as x increases to the maximum or decreases from the maximum, area will be the same
Ex. 5 The graph is the deer population introduced on an island. Interpret the graph.
Ex. 5 cont. y intercept – 75 (initial population)
Ex. 5 cont. y intercept – 75 (initial population) Positive between 0 and 5. 5 (deer died out before the end of year 6)
Ex. 5 cont. y intercept – 75 (initial population) Positive between 0 and 5. 5 (deer died out before the end of year 6) Decreased year 1
Ex. 5 cont. y intercept – 75 (initial population) Positive between 0 and 5. 5 (deer died out before the end of year 6) Decreased year 1 Relative maximum – x = 4
Ex. 5 cont. y intercept – 75 (initial population) Positive between 0 and 5. 5 (deer died out before the end of year 6) Decreased year 1 Relative maximum – x = 4 Relative minimum – x = 5. 5
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