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Express each relation in the form of ord...

Express each relation in the form of ordered pair and check whether is it a function or not?
(i) `f={(x,y): y=3x, x in {1,2,3}, y in {3,6,9,12}}`
`(ii) g={(x,y): y gt x + 1 , x in {1,2}, y in {2,4,6}}`
(iii) `h={(x,y): x+y=3,x,y in {0,1,2,3}}`

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The correct Answer is:
(i) f = { (1,3) , (2,6) , (3,9)} is a function .
(ii) g = {(1,4) , (1,6) , (2,4) , (2,6)} is not a function .
(iii) h = {(0,3) , (1,2) , (2,1) , (3,0)} is a function .
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