From the following table, determine if x and y are in direct proportion or not.

(i)


(ii)


(iii)


In direct proportion, = k(constant)


For table (a),




i.e.


So, (a) is not in direct proportion.


For table b,




i.e.


So, (b) is in direct proportion.


For table (c)




i.e.


so, (c) is in direct proportion.


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