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Linear Functions

SAT Math· difficulty 2/5

A taxi charges a flat \3.00feeplusfee plus$2.50permile.Whichfunctiongivesthecostper mile. Which function gives the costCindollarsforin dollars form$ miles?

  • A

    C=3m+2.5C = 3m + 2.5

  • B

    C=2.5mC = 2.5m

  • C

    C=2.5m+3C = 2.5m + 3

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  • D

    C=3+2.5/mC = 3 + 2.5/m

Explanation

The base fee is the yy-intercept; the per-mile rate is the slope.

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