determine the value of k for which the system is equations are co-insidence, if 7x-y=5 and 21x-ky=3

determine the value of k for which the system is equations are co-insidence, if 7x-y=5 and 21x-ky=3
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????????????? "the system is equashuns are ko-insidens ???????????????

??? that meen yu hav a problem ????
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