Do Now Given h(t)= 3− x 1.What is the slope? 2.What is the y-intercept Given t(x)= - 3x − 1 1.What is the slope? 2.What is the y-intercept.

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Do Now Given h(t)= 3− x 1.What is the slope? 2.What is the y-intercept Given t(x)= - 3x − 1 1.What is the slope? 2.What is the y-intercept

Do Now Given h(t)= 3− t 1.What is the slope? Answer: -1 2.What is the y-intercept Answer: 3 Given t(x)= - 3x − 1 1.What is the slope? Answer: -3 2.What is the y-intercept Answer: -1

Target: I can find the slope and the y-intercept of a line from a table of values using a Graphing Calculator. Designed by Skip Tyler, Varina High School

Key and menu we use. We use only the STAT key. On Edit Menu: Choose 1. Edit to enter “x” and “y” values Then Press “STAT” again and then using the right key choose “CALC” menu. Then pick #4 LinReg(ax+b) The values for slope and y intercept are given.

Finding m and b using the TI-84 1.From the home screen, press STAT, 5, and then ENTER. This sets up the calculator’s built-in list editor.

2. Next, press STAT, and ENTER to select the list editor. We’re going to be using L1 and L2 for this tutorial– if either has data in it, clear the list by selecting the name with the arrow buttons and pressing CLEAR, then ENTER. Finding m and b using the TI-84

3. Now enter the X data into L1 and Y data into L2 by using the arrow buttons to select a cell, then pressing ENTER, typing in the corresponding number, and pressing ENTER again to confirm. The lists should automatically scale as you add more data. Finding m and b using the TI-84

4. When done, press STAT, CALC, 4 to select LinReg(ax+b). Finding m and b using the TI-84

5. Press ENTER to confirm. The calculator will display your slope (a) and y-intercept (b). Finding m and b using the TI-84 Note that the calculator uses a instead of m for the slope.

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