Determine whether y varies directly with x. If so, find the constant of variation k.?

Determine whether y varies directly with x. If so, find the constant of variation k.

3y = –7x – 18

Find the value of y for a given value of x, if y varies directly with x.

If y = 2.52 when x = 8.4, what is y when x = 2.7?

A. 9

B. –9

C. 0.81

D. –0.81

2 Answers

  • 3y = –7x – 18

    y does not vary directly with x

    ————————————————–

    y varies directly with x.

    y = kx , where k is any constant

    y=2.52 when x=8.4

    2.52 = k(8.4)

    k = 2.52/8.4 =0.3

    y=0.3x

    when x=2.7

    y=(0.3)(2.7) = 0.81

  • -6y=-5x

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