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Linear Equations in One Variable

SAT Math· difficulty 4/5

A model gives revenue R(x)=50xR(x) = 50x and cost C(x)=200+30xC(x) = 200 + 30x. The break-even occurs at what xx?

  • A

    8

  • B

    5

  • C

    20

  • D

    10

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Explanation

50x=200+30x50x = 200 + 30x → 20x=20020x = 200 → x=10x = 10.

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