Algebraically, this can be modeled by y 293.3x 6878.95 where x represents the number of years after the 1994–1995 school year. (So, x 0 represents the 1994–1995 school year, x 1 represents the 1995–1996 school year, etc.) y represents the per-pupil spending on education, in dollars. (www.effwa.org) a) From the graph, estimate the amount spent per pupil during the following school years: 1994–1995, 1997–1998, and 2001–2002. b) Determine the amount spent during the same school years as in a) using the equation. How do these numbers compare with the estimates from the graph? c) Graph the line that models the data given on the original graph. Use an appropriate scale. d) Can we use the equation y 0.001x 29.86 to determine the pressure at 10,000 ft? Why or why not? 84) The graph shows the actual per-pupil spending on education in the state of Washington for the school years 1994–2003. x Per-pupil spending on education in the state of Washington y 5 Year Per-pupil spending, in dollars 10,000 9500 9000 8500 8000 7500 7000 6500 6000 0 1 2 3 4 6 7 8 R4) How can you tell if a line is going to be drawn horizontally? R5) In what other courses (besides math) have you had to use an equation of a line? R6) When using the intercepts to graph a line, why should we always fi nd a third point? R1) Which objective is the most diffi cult for you? R2) When starting to graph a line, how do you determine which x or y values to start with? R3) How can you tell if a line is going to be drawn vertically? 154 CHAPTER 4 Linear Equations in Two Variables and Functions www.mhhe.com/messersmith
messersmith_power_intermediate_algebra_1e_ch4_7_10
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