Linear Functions

SAT Math· difficulty 4/5

Plan A charges \30/moplusmo plus $0.05/text.PlanBcharges/text. Plan B charges $50/$mo with unlimited texts. For what number of texts does Plan B become cheaper?

  • A

    More than 400400

    check_circle
  • B

    More than 500500

  • C

    Exactly 400400

  • D

    More than 200200

Explanation

30+0.05x>500.05x>20x>40030 + 0.05x > 50 \Rightarrow 0.05x > 20 \Rightarrow x > 400.

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