Goals: Graph and interpret equations in slope- intercept form that model real life situations. Use a graphing calculator to graph linear equations. Eligible.

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Objective - To graph linear equations using the slope and y-intercept.

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Presentation transcript:

Goals: Graph and interpret equations in slope- intercept form that model real life situations. Use a graphing calculator to graph linear equations. Eligible Content: A / A / A / A A / A / A

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

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.

 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?

 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?

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

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

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

 None