If a function f is defined by f(x)= (2x-1)/3 for all non zero numbers x. If f(a) = 1 and f(ab) = 1/9 then b= ? Choose the correct choice from the following answers:
A) 3  B) 1/3  C) -1/3  D) -3  E) -12
Given that f(x)= (2x-1)/3 and f(a) = 1, then f(a) =(2a-1)/3=1 ===&gt; a=2, then backsolve using the answer choices:   f(ab) = f(2b) = 1/6   A) 3 ===&gt; f(2*3) = f(6) = (12-1)/3 = 11/3   1/3) 1/3 ===&gt; f((2*1/3) = f(2/3) = (4/3-1)/3 = 1/9 WINS   C) -1/3 ===&gt; f(2*-1/3) = f(-2/3) = (-4/3-1)/3 = -7/9   D) -3 ===&gt; f(2*-3) = f(-6) = (-12-1)/3 = -13/3   E) -12 ===&gt; f(2*-12) = f(-24) = (-24-1)/3 = -25/3   Answer: 1/3
<result>B</result>
If a function f is defined by f(x)= (2x-1)/3 for all non zero numbers x. If f(a) = 1 and f(ab) = 1/9 then b= ?