# 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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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

x-axis y-axis y-interceptx-intercept

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

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

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

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

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

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

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.

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.

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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