Answer :

Here,R={(x,y) : x, yϵZ, y=2x-4}


Now,(a,-2)ϵ R -2=2a-4


2a=-2+4


2a=2


a=1


Also,(4,b2)ϵ R b2=2×4-4


b2=8-4


b2=4


b=±2


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