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Linear Functions

SAT Math· difficulty 3/5

The average rate of change of a linear function from x=1x = 1 to x=4x = 4 is 55. From x=4x = 4 to x=9x = 9, it is:

  • A

    Cannot be determined

  • B

    55

    check_circle
  • C

    33

  • D

    53\dfrac{5}{3}

Explanation

A linear function has constant slope =5= 5 between any two points.

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