The graph shows how many bottles a machine caps in a certain number of seconds. A graph showing number of bottles capped on the y axis and number of seconds on the x axis. A line begins at the origin and passes through the points 15 comma 300, 30 comma 600, and 45 comma 900.

Part A
What is the constant of proportionality, and what does it mean in this situation?
Use the drop-down menus to show and explain your answer.

The constant of proportionality is
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; the machine caps
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bottles in
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.

Part B
Which of the following is an ordered pair on the graph? What does it represent in this situation?

(45, 90); the machine caps 45 bottles in 90 seconds.

(45, 900); the machine caps 45 bottles in 900 seconds.

(45, 900); the machine caps 900 bottles in 45 seconds.

(900, 45); the machine caps 900 bottles in 45 seconds.