Question

For each set of ordered pairs below, state whether it is a function or not give reasons

(i){(3, 2), (4, 2), (5, 2)}
if a function enter 1 else 0

Answer 1

A function $f$ from $X$ to $Y$ is a subset of the Cartesian product $X$ $Y$ subject to the following condition: every element of $X$ is the first component of one and only one ordered pair in the subset. In other words, for every $x$ in $X$, there is exactly one element $y$ such that the ordered pair $(x,y)$ is contained in the subset defining the function $f$.

And given ordered pairs satisfy all the condition