Find the value of x so that f(x) =7. f(x)=2x-9

Question

find the value of x so that f(x) = 7 

Answer 1

Find x such that   7 = 2x - 9

                        16 = 2x               [add 9 to both sides]

                         8 = x              [divide both sides by 2]

 

Check:

   Is  f(8) = 7    ?

       2(8) - 9 = 7   ?

        16 - 9 = 7   ?

            7 = 7   ?yes