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r varies directly as s and t. one set of values is r=28,s=7, t=8. find r when s=12 and t=9

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find r when s=12 and t=9

direct-variation

asked Nov 27, 2013 in ALGEBRA 2 by dkinz Apprentice

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1 Answer

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r varies directly s and t then r = kst

Given r = 28, s = 7, t = 8

28 = k *7*8

28 = k*56

28/56 = k

k = 1/2

Now find r when s=12, t = 9

r = 1/2*12*9

r = 54

answered Nov 28, 2013 by william Mentor

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