Graphs of Piecewise Linear Functions Define appropriate quantities from a situation, choose and interpret the scale and the origin for the graph, and graph.

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Graphs of Piecewise Linear Functions Define appropriate quantities from a situation, choose and interpret the scale and the origin for the graph, and graph the piecewise linear function.

Learning Goal 2 (HS.N-Q.A.1, 2, 3): The student will be able to use units to solve multi-step contextual problems.

Video Watch the following video. Your goal is to be able to describe the motion of the man in words. Describe the motion of the man in the video. Describe the man in terms of change in elevation of the man and the amount of time.

Video…Analyze How high do you think the man was at the top of the stairs? How did you estimate that elevation? Were there intervals of time when his elevation wasn’t changing? Was he still moving? Did his elevation ever increased? When?

Video…Graph How should we label the vertical axis? What measurement should we choose (feet or meters)? How should we label the horizontal axis? What unit of measure should we choose? Should we measure the man’s elevation to his feet or to his head on the graph? The man starts at the top of the stairs. Where would that be located on the graph? Draw the graph.

What the graph could look like Elevation (feet) Time (Seconds) Elevation vs. Time Graph Man in Green Jacket

Elevation Vs. Time Graph #2 With a partner describe what this person might have been doing.

What is happening in the story when the graph is increasing? Decreasing? Staying constant? What does it mean for one part of the graph to be steeper than another part? How does slope of each line segment relate to the context of the person’s elevation?

Is it possible that this is a graph of a person moving up and down a vertical ladder? Is it possible for someone walking on a hill to produce this graph? What was the average rate of change of the person’s elevation between time 0 minutes and time 4 minutes? 10 / 4 feet per minute or 2.5 feet per minute.

What type of equation (s) would be required to create this graph?

Piecewise Linear Function Definition: Given non-overlapping intervals on the real number line, a (real) piecewise linear function is a function from the union of the intervals on the real number line that is defined by (possible different) linear functions on each interval. All the graphs we studied today are Piecewise Linear Functions. Here are a few more:

…union of intervals.. Piecewise linear functions are defined over an interval of time shown on the horizontal axis. List those time intervals. (0 to 2) (2 to 5) (5 to 7)

Video Link for Classwork