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given that (y)/(x) = (7)/(2), evaluate (7x+y)/(x-1/7y)

(7x + y) / (x - (1/7)y) =       (now divide above and below by x)

(7 + (y/x)) / ( 1 - (1/7)(y/x)) =   (now substitute for (y/x) = (7/2))

(7 + (7/2) / (1 - (1/7)(7/2)) =

(21/2) / (1 - 1/2) =

(21/2) / (1/2) =

21

by Level 11 User (81.5k points)
7x-y,for x=7and y=5
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