202 Chapter 3 Graphing Linear Equations in Two Variables 28. The age and systolic blood pressure (in millimeters of mercury, mm Hg) for eight different women are given in the table. a. Write the corresponding ordered pairs using the woman’s age as the x-variable and the systolic blood pressure as the y-variable. Interpret the meaning of the first ordered pair. b. Plot the data points on a rectangular coordinate system. 29. The following table shows the average temperature in degrees Celsius for Montreal, Quebec, Canada, by month. a. Write the corresponding ordered pairs, letting correspond to the month of January. x 1 b. Plot the ordered pairs on a rectangular coordinate system. 1 2 3 4 5 6 7 8 9 10 11 12 20 18 16 14 12 10 8 4 6 2 0 2 4 6 8 10 Temperature (°C) Month y x 30. The table shows the average temperature in degrees Fahrenheit for Fairbanks, Alaska, by month. a. Write the corresponding ordered pairs, letting correspond to the month of January. x 1 b. Plot the ordered pairs on a rectangular coordinate system. 12 Temperature (°F) Month 70 60 50 40 30 20 10 0 10 y x 1 2 3 4 5 6 7 8 9 10 11 Month, x Temperature (C), y Jan. 1 10.2 Feb. 2 9.0 March 3 2.5 April 4 5.7 May 5 13.0 June 6 18.3 July 7 20.9 Aug. 8 19.6 Sept. 9 14.8 Oct. 10 8.7 Nov. 11 2.0 Dec. 12 6.9 Month, x Temperature (F), y Jan. 1 12.8 Feb. 2 4.0 March 3 8.4 April 4 30.2 May 5 48.2 June 6 59.4 July 7 61.5 Aug. 8 56.7 Sept. 9 45.0 Oct. 10 25.0 Nov. 11 6.1 Dec. 12 10.1 250 0 0 20 40 60 80 100 Systolic Blood Pressure Age 200 150 100 50 y x Age Systolic Blood (Years) Pressure (mm Hg) 57 149 41 120 71 158 36 115 64 151 25 110 40 118 77 165
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