Let R={(x,y): x,y belongs to Z, y=2x-4}.If(a,-2) and (4,b2) belongs to R , then write the values of a and b.

-2 = 2(a) - 4 {Using the given relation}

ie. 2a = 2 which gives a = 1.

b^{2} = 2(4) - 4 { U sing the relation}

ie. b^{2} = 4 which gives b = +2 or -2.

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