.If x and y vary directly find the proportionality constant “k”.
No of friends(x) 1 2 5 12 15
No of pens(y) 2 4 10 24 30
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since K is constant we can find K when given any point by dividing the y-coordinate by the x-coordinate for example if y varies directly as x, and y =6 when x= 2, the constant of variation is k = = 3 . thus, the equation describing is y=3×
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