2. Graphs of Two Variables The Coordinate System Grade Point Average Albert e (25, 3.5) Graph pint average is measured on the vertical Alfred E axis and study time on (5,2.0) the horizontal axis Albert E. and Alfred E are represented by 0.5 various points. We can see from the graph that 0 15 20 30 students who study Study Time more tend to get higher (hours per week) grades
2. Graphs of Two Variables: The Coordinate System 0 0.5 1 1.5 2 2.5 3 3.5 4 0 5 1 0 1 5 2 0 2 5 3 0 Albert E. (25, 3.5) Alfred E. (5, 2.0) Graph pint average is measured on the vertical axis and study time on the horizontal axis. Albert E. and Alfred E. are represented by various points. We can see from the graph that students who study more tend to get higher grades. Grade Point Average Study Time (hours per week)
3. Curves in the Coordinate System Income Price 20,000 $30,000 40,000 $10 2 novels 5 novels 8 novels 12 8 10 13 17 20 18 21 24 22 25 28 This table shows the number of novels Emma buys at various incomes and prices For any given level of incomes, the data on price and quantity demanded can be graphed to produce Emma's demand curve for novels
3. Curves in the Coordinate System Income Price $20,000 $30,000 $40,000 $10 2 novels 5 novels 8 novels 9 6 9 12 8 10 13 16 7 14 17 20 6 18 21 24 5 22 25 28 This table shows the number of novels Emma buys at various incomes and prices. For any given level of incomes, the data on price and quantity demanded can be graphed to produce Emma’s demand curve for novels
Demand curve Price of Novers The line di shows how 10 Emma's purchases of 13,8 novels depend on the price of novels when 6 her income is held constant Because the Demand, D1 price and the quantity demanded are negatively related, the demand curve slopes 5 1317 25 downward Quantity of Novels Purchased
Demand Curve Quantity of Novels Purchased 5, 10 9, 9 13, 8 17, 7 21, 6 25, 5 0 2 4 6 8 1 0 1 2 0 5 9 1 3 1 7 2 1 2 5 Price of Novels Demand,D1 The line D1 shows how Emma’s purchases of novels depend on the price of novels when her income is held constant. Because the price and the quantity demanded are negatively related, the demand curve slopes downward