22. TRAVEL The cost for cars entering President George Bush Turnpike at Beltline road is given by the relation = 0.75, where is x x the dollar amount for entrance to the toll road and is the number of passengers. Determine if this relation is a function. Explain. y 23. CONSUMER CHOICES Aisha just received a $40 paycheck from her new job. She spends some of it buying music online and saves the rest in a bank account. Her savings is given by = 40 1.25x, where is the number of songs she downloads at $1.25 per f(x) x – song. a. Graph the function. b. Find and What do these values represent? f(3), f(18), f(36). c. How many songs can Aisha buy if she wants to save $30? 1.7 Textbook Homework Algebra 1 Section 1.8 Notes: Interpreting Graphs of Functions Warm-up Determine whether each relation is a function. 1. 2. 3. 4. If , find . 5. The graph of is shown. What is the approximate solution if ? the of a point where a graph crosses the y axis. y-intercept: – x-intercept: the of a point where a graph crosses the x axis. – Example 1: The graph shows the cost at a community college y as a function of the number of credit hours taken x. a) Identify the function as linear or nonlinear. b) Estimate and interpret the intercepts of the function.
22. TRAVEL The cost for cars entering President George Bush Turnpike at Beltline road is given by the relation x = 0.75, where x is the dollar amount for entrance to the toll road and y is the number of passengers. Determine if this relation is a function. Explain. 23. CONSUMER CHOICES Aisha just received a $40 paycheck from her new job. She spends some of it buying music online and saves the rest in a bank account. Her savings is given by f(x) = 40 – 1.25x, where x is the number of songs she downloads at $1.25 per song. a. Graph the function. b. Find f(3), f(18), and f(36). What do these values represent? c. How many songs can Aisha buy if she wants to save $30? 1.7 Textbook Homework Algebra 1 Section 1.8 Notes: Interpreting Graphs of Functions Warm-up Determine whether each relation is a function. 1. 2. 3. 4. If , find . 5. The graph of is shown. What is the approximate solution if ? y-intercept: the of a point where a graph crosses the y – axis. x-intercept: the of a point where a graph crosses the x – axis. Example 1: The graph shows the cost at a community college y as a function of the number of credit hours taken x. a) Identify the function as linear or nonlinear. b) Estimate and interpret the intercepts of the function.
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