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Linear Equations in One Variable

SAT Math· difficulty 4/5

A cell phone plan has cost C(m)=a+bmC(m) = a + bm where mm is minutes. Data: (100,30),(300,50)(100, 30), (300, 50). What is bb?

  • A

    0.200.20

  • B

    0.150.15

  • C

    0.050.05

  • D

    0.100.10

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Explanation

Slope =50−30300−100=20200=0.10= \frac{50 - 30}{300 - 100} = \frac{20}{200} = 0.10.

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