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Write the following relations as sets of ordered pairs and find which of them are function : `{(x , y): x+y=3, x , y in {0,1,2,3}}`

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Given, `{(x , y): x+y=3, x , y in {0,1,2,3}}`
`x+y=3 or y=3-x`
Putting `x=0,1,2,3 ` in y
`y=3,2,1,0` respectively
So,R=`{(0,3),(1,2),(2,1),(3,0)}`
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