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Linear Equations in One Variable

SAT Math· difficulty 4/5

A table shows monthly cost vs. data: (2 \text{ GB}, \30),, (5 \text{ GB}, $45).Findalinearcostequation. Find a linear cost equation C(g)$.

  • A

    C=5g+20C = 5g + 20

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  • B

    C=3g+24C = 3g + 24

  • C

    C=4g+22C = 4g + 22

  • D

    C=5g+25C = 5g + 25

Explanation

Slope =45−305−2=5= \frac{45-30}{5-2} = 5. With (2,30)(2, 30): b=20b = 20. So C=5g+20C = 5g + 20.

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