# Algebra

The circumference,y, of a circle varies directly with the diameter,x, of the circle. Write an equation if y=44cm when x=14cm.

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1. y = (22/7) x
is the equation they want you to write.

It is an approximation to the correct relationship, which is y = pi * x

22/7 = 3.14286..
pi = 3.14159..

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