Answer:
(X,Y)
(2,2)
(4,3)
(7,4.5)
(9,5.5)
Explanation:
To match the input values with the output, substitute each value on the right into the equation.
1) x

The equation remains the same. Hence, x maps onto y.
2) 2

Therefore, map 2 with 2.
3) 4

Therefore, match 4 with 3.
4) 7

Therefore, match 7 with 4.5.
5) 9

And finally, match 9 with 5.5.