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if r varies as directly as w and the constant of variation is 12 what is the value of w when r = 42

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If r varies as directly as w, and the constant of variation is12, what is the value of w when r = 42?

direct-variation

asked Nov 27, 2013 in ALGEBRA 2 by chrisgirl Apprentice

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1 Answer

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r varies as directly as w then r = kw

The given numbers k = 12, r = 42

Substitute the values of r, k

42 = 12w

Divide to each side by 12.

42/12 = 12w/12

7/2 = w

answered Nov 28, 2013 by william Mentor

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