1. Goals: Graph and interpret equations in slope- intercept form that model real life situations. Use a graphing calculator to graph linear equations. Eligible Content: A1.1.2.1.1 / A1.1.2.1.3 / A1.2.1.1.1 / A1.2.1.2.1 A1.2.1.2.2 / A1.2.2.1.3 / A1.2.2.1.4

2.  Slope is rate of change  y-intercept is the beginning amount

3. The graph shows the number of cookies left on a plate after time has passed at a party. Find the slope and tell what it reveals about the situation. Find the y-intercept and tell what it reveals about the situation.

4.  The equation h = ½ t + 24 models changing river heights. h represents the height of the river (in feet) and t represents the time (in hours) since the flooding began. What does the slope of the equation reveal about this situation? What does the y-intercept of the equation reveal about this situation?

5.  The equation s = 15t + 25 models changing speeds of a car as it enters an expressway. s represents the speed of the car (in miles per hour) and t represents the time (in minutes). What does the slope of the equation reveal about this situation? What does the y-intercept of the equation reveal about this situation?

6. Equations must be in slope intercept form.  Press Y= button  Type in equation  Press GRAPH button  To change the x and y axes press WINDOW

7. Graph each equation on your calculator: 1. y = 3x + 4 2. y = -5x + 7 3. 2x + y = 8 4. 3x – 2y = 10

8. Graph each of the word problems from earlier in class:  River: y = ½ x + 24  Car: y = 15x + 25

9.  None