If y varies directly as x, and y=14 when x=3.5 find y when x=2

Question

Mathematics

Jake Davidson

11 January, 17:35

If y varies directly as x, and y=14 when x=3.5 find y when x=2

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Answers (1)

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Camilla Vaughan · Answer 1

y = 8

y varies directly as x

y ∞ x

y=14 when x=3.5

y = kx

k is a constant, when multiplied by x, you get y

14 = 3.5k

Solve to find k:

14/3.5 = k

14/3.5 = 4

k = 4

y = 4x

Find y when x=2

y = 4x

y = 4 (2)

y = 8