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.

b)

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

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

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.

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 rapidly2000-1005 – 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.

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

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

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 shortagesIncrease retirement ageStrengthen health care and social security for older Canadians