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Mathematics, 15.04.2020 00:15 FombafTejanjr3923

LetX1={5,10,15,20}andY1={5,10,15,20 ,25}. Using the formal definition of a func-tion, determine which of the following subsets ofX1×Y1correspond to the functions ofX1→Y1.
Justifyyour answer by providing reasons why each is or is not a function.
a) 1(a)f={(5,20),(10,15),(5,10),(15,5) ,(20,5)}
b) 1(b)f={(5,25),(10,5),(15,5),(20,10) ,(5,25)}
c) 1(c)f={(5,5),(10,5),(15,5)}

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