Linear Functions

SAT Math· difficulty 2/5

If yy varies directly with xx and y=12y = 12 when x=4x = 4, find yy when x=7x = 7.

  • A

    1515

  • B

    2828

  • C

    2424

  • D

    2121

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Explanation

k=12/4=3k = 12/4 = 3, so y=37=21y = 3 \cdot 7 = 21.

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