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TODAY IN ALGEBRA…  Warm Up: Find the x and y intercepts and graph  Learning Goal: 4.4 You will find the slope of a line and interpret as a rate of change.

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Presentation on theme: "TODAY IN ALGEBRA…  Warm Up: Find the x and y intercepts and graph  Learning Goal: 4.4 You will find the slope of a line and interpret as a rate of change."— Presentation transcript:

1 TODAY IN ALGEBRA…  Warm Up: Find the x and y intercepts and graph  Learning Goal: 4.4 You will find the slope of a line and interpret as a rate of change.  Independent Practice

2 x-axis y-axis y-interceptx-intercept

3 4.4 FINDING SLOPE: CALCULATING AND GRAPHING **Always move to the right so that your “run” is always positive!

4 4.4 FINDING SLOPE: Calculating and with graphs EXAMPLE: Find the slope of the line shown.

5 4.4 FINDING SLOPE: Calculating slope given two points. PRACTICE: Find the slope of the line that passes through the points.

6 4.4 FINDING SLOPE: Graphs of different slopes. PRACTICE: Find the slope of the line shown. NEGATIVE SLOPE ZERO SLOPEUNDEFINED SLOPE

7 4.4 FINDING SLOPE: Calculating slope given two points. PRACTICE: Find the slope of the line that passes through the points and describe the slope. NEGATIVE SLOPE ZERO SLOPE UNDEFINED SLOPE

8 4.4 CLASSIFYING SLOPES CLASSIFICATION OF LINES BY SLOPE POSITIVE SLOPE INCREASING NEGATIVE SLOPE DECREASING ZERO SLOPE HORIZONTAL LINE UNDEFINED SLOPE VERTICAL LINE

9 4.4 SLOPE: FINDING THE RATE OF CHANGE INTERNET CAFÉ: The table shows the cost of using a computer at an Internet café for a given amount of time. Find the rate of change in cost with respect to time. Time (hours)246 Cost (dollars)71421 The rate of change in cost is $3.50 per hour.

10 4.4 SLOPE: FINDING THE RATE OF CHANGE PRACTICE: The table shows the cost to paint a house for a given number of hours. Find the rate of change in cost with respect to time. Time (hours)468 Cost ($)90135180 The rate of change in cost is $22.50 per hour.

11 HOMEWORK #4: Pg. 239: 4-7, 9-19 odd, 24-26 If finished, work on other assignments: HW #1: Plotting points and graphing WS HW #2: Pg. 219: 1-33 odd HW #3: Pg. 229: 1-41 odd, 45

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