Question

Given following table

$x$	$y$
-2	4
-1	2
1	2
2	4

This is

• A. not a Relation
• B. not a Function
• C. a Function

Answer 1

The correct option is C a Function

$x$	$y$
-2	4
-1	2
1	2
2	4

This is a relation.
For $x=-2,y=4$
For $x=-1,y=2$
For $x=1,y=2$
and for $x=2,y=4$
We can see that every $x$ value has only one $y$ value that is associated with it.
For a relation to be a function, each and every value in $x$ must correspond to a different value in $y$.
$\therefore$ the given relation is a function.