Which ordered pair is not a solution of f(x) = 2x + 9?
(0, 9)
(7, 23)
(7, 23)
(2, 13)

What you do is subsitute the first number in the pair for x and subsitute the second number for f(x)

you must have made a typing error when typing the options since they are alll correct
proabably one of the two (7,23) is mistyped

basically one example is the point (0,9)
x=0
f(x)=9
subsitute
9=2(0)+9
9=0+9
9=9
this is true so it is a soltuion

the answer choice is not listed (probably because of a typo)