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Describe the relationship shown in each graph. a) Mary’s Earnings at American Eagle When the hours increase, the Earnings increase by a constant amount.

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Presentation on theme: "Describe the relationship shown in each graph. a) Mary’s Earnings at American Eagle When the hours increase, the Earnings increase by a constant amount."— Presentation transcript:

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2 Describe the relationship shown in each graph. a) Mary’s Earnings at American Eagle When the hours increase, the Earnings increase by a constant amount making the graph linear.

3  b) The amount of money in the bank increases over time. At first quite slowly and then faster and faster.

4 c) Temperature of a Cooling cup of Hot Chocolate The vertical distance between points is decreasing. The temperature is decreasing as time passes. At first rapidly and then levelling off at room temperature

5 d) The vertical distances between pairs of vertical points with equal horizontal distances is decreasing and then increasing. As fertilizer use increases, the crop yield increases, reaches a maximum and then decreases.

6 1975-1980– The births stay fairly constant. 1980-1990 – The births are increasing, slowly at first and then more rapidly. 1990-2000 – The number of births is decreasing rapidly 2000-1005 – The number of births is increasing slowly. Break the Graph into sections with different trends: 1945-1960 – The graph is increasing over time quite rapidly. There is a maximum at year 1960. 1960-1975– The graph is decreasing rapidly at first and then slowly and then more rapidly again.

7 Use the graph to predict the number of Canadians in each age group:

8 First, extend your graph to include the years needed using the trends. Under the Age of 15: Age 60 and over: Age 80 and over: About 5.8 million About 5.7 million About 1 million

9 What decisions might the Canadian Government make in response to the trends in the graph? The trends indicate that a declining number of younger Canadians will have to support an increasing number of older Canadians. Therefore governments may:  Increase immigration levels to prevent labour shortages  Increase retirement age  Strengthen health care and social security for older Canadians


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