Question: -2 -1 -2 -1 0 Example 1 The linear function y = 29.8x represents the number y of kilometers Earth travels in orbit around the

-2 -1 -2 -1 0 Example 1 The linear function y =
-2 -1 -2 -1 0 Example 1 The linear function y = 29.8x represents the number y of kilometers Earth travels in orbit around the Sun in x seconds. (a) Find the domain of the function. Is the domain discrete or continuous? Explain. (b) Graph the function using its domain. a. Earth can travel in orbit for part of a second, The number x of seconds Earth travels in orbit can be any value greater than or equal to O. Earth's Orbit Around the Sun So, the domain is x 2 0, and it is continuous. b. Make an input-output table to find ordered pairs. 180 x 0 (4, 119.2) 2 3 4 120 Distance (kilometers) y = 29.8x 07 (3, 89.4) 29.8 59.6 89.4 119.2 (2, 59.6) Plot the ordered pairs. Draw a line through the points starting at (0, 0). (1, 29.8) 4 Use an arrow to indicate that the line continues without end. 2 6 x Time (seconds) Practice Check your answers at BigIdeasMath.com. Copy and complete the table. 2 0 2 2. X- -2 3. BOATING A speed boat tour costs $60 per ticket. There are 5 tickets left. The total cost y of the tickets is a function of the number t of tickets you buy. a. Find the domain of the function. Is the domain discrete or continuous? Explain. b. Graph the function using its domain

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