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Question


For the linear function f , the table above gives some values of x and their corresponding values f (x), where c is a constant. Which of the following equations defines f ?

  1. f (x) = x + c
  2. f (x) = x + 3c
  3. f (x) = cx + c
  4. f (x) = 3cx + 3c

The correct answer is: f (x) = cx + c


    HINT :- Let the linear function be f(x) = ax + b substitute values and find a and b
    Let the linear function be f(x) = ax + b
    Step 1 : find b in terms of c
    Let f(x) = ax + b at x =0 , f(x) = c
    c = a(0) + b ⇒ ∴b = c
    Step 2: find a in terms of c by substituting x = 1 and f(x) = 2c
    ln⁡f(x) = ax + b at x = 1 ,f(x) = 2c
    2c = a(1) + b⇒ ∴a + b = 2c
    Substitute b=c in the condition
    a + b = a + c = 2c ⇒ a = c
    As a = c and b = c then f(x) = cx + c.

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