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direct variation

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if y = 12 when x =3 , find y when x = 7

direct-variation

asked Dec 5, 2013 in ALGEBRA 2 by dkinz Apprentice

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1 Answer

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y is direct variation to x then y = kx

Given numbers form a ratio expressed as y/x = 12/3

To find y when x = 7

We set up another ratio is y/7.

By the definition both ratios are equal 12/3 = y/7

4 = y/7

Multiple to each side by 7.

4*7 = 7y/7

y = 28

answered Dec 5, 2013 by william Mentor

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