Which of the following are true of linear functions? Select all that apply.

A function assigns exactly one output to each input, so A is true. A linear function graphs as a straight line and has a constant rate of change, so B and D are true. It can cross the y-axis in only one place, and it does not have to cross the x-axis—for example, the line y = 2 never crosses it—so C and E are false.

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