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X is partly constant and partly varies with y.when y=3,x=7

2 answers

What are we finding?
The equation?

let y = kx
for the given values:
3 = 7k
k = 3/7

so y = (3/7)x
or x = (7/3)y
or y/x = 3/7
or y : x = 3 : 7
etc

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