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July 6, 2015

Homework Help: maths, variations checking!

Posted by hayley on Tuesday, December 18, 2007 at 5:57am.

question: given that y is inversely proportional to (x-1),

A) express y in terms of x and a constant k
b) give that y=5 when x=3, find x when y=25

answer: A)y=-k(x-1)
y=-kx+k

B)y=5, x=3, k(constant)=3x5
k=15
25=-15x+15
10=-15x
x=-10/15

is this correct? i'm not too sure about this variation thing, i would appreciate your help!

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