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# Let X = {1,2,3,4,5,6,7,8,9}. Let $R_1\;andR_2$ be relations in x given by $R_1=\{(x,y):x-y\;is\;divisible\;by\;3\}\;and$$R_2=\{(x,y)!\{x,y\} \varepsilon \{1,4,7\}or\{x,y\} \varepsilon \{2,5,8\}$$or \{x,y\} \varepsilon \{3,6,9\}\}.\; Show\; that \;R_1=R_2.$

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