Question

If (7,2) is an ordered pair of the function f(x) which of the following must be an ordered pair of the inverse of f(x)?

(2,7)
(2,2)
(7,2)
(7,7)

Answer 1

(2,7)

Explanation:

Here is an example just to show that it works.

3x+2y=25

3(7) + 2(2) = 21 + 4 = 25

3y+2x=25

25-2x=3y

25/3 - 2/3x = y

25/3 -2*2/3=25-4/3=21/3=7

Answer 2

All you have to do is to reverse the order of the x and y components of (7,2):
(2,7).