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Exercise: Six Concept Check

Post your 50-word response to the following:
How can you determine if two equations form lines that are perpendicular without graphing?
Give some examples of such equations.

Application Practice

Answer the following questions. Use Equation Editor to write mathematical expressions and equations. First, save this file to your hard drive by selecting Save As from the File menu. Click the white space below each question to maintain proper formatting.

1. Imagine you are at a gas station filling your tank with gas. The function C(g) represents the cost C of filling up the gas tank with g gallons. Given the equation
a. What does the number 2.68 represent?
b. Find C(5).
c. Find C(11).
d. For the average motorist, name one value for g that would be inappropriate for this function's purpose. Explain why you chose that number.
e. If you were to graph C(g), what would be an appropriate domain and range? Explain your reasoning.

2. Examine the rise in gasoline prices from 1997 to 2006. If the price of regular unleaded gasoline in January 1997 was $1.09, and in January 2006, the price of regular unleaded gasoline was $2.03

Use the coordinates (1997, 1.09) and (2006, 2.03) to find the slope, or rate of change, between the two points. Describe how you arrived at your answer.

3. The linear equation

1611_4.png

Represents an estimate of the average cost of gas for year x starting in 1993. The year 1994 would be represented by x = 1, for example, because it is the first year in the study. Similarly, 2002 would be year 9, or x = 9.

a. What year would be represented by x = 5? 

b. What x-value represents the year 2020?

c. What is the slope, or rate of change, of this equation?

d. What is the y-intercept?

e. What does the y-intercept represent?

f. Assuming this growth trend continues, what will the price of gasoline be in the year 2020? How did you arrive at your answer?

4. The line

1120_4.png

Represents an estimate of the average cost of gasoline each year. The line

1512_4.png

Estimates the price of gasoline in January of each year

a. Do you expect the lines to be intersecting, parallel, or perpendicular? Explain your reasoning.

b. Use the equations of the lines to determine if they are parallel. What did you find?

c. Did your answer to Part b. confirm your expectation in Part a?




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