Question

Find a, if f(x) = ax + 5 and f(1) = 8.

Answer 1

Answer:

a = 3

Step-by-step explanation:

a*x + 5 = 8

a * 1 + 5= 8

a = 8 - 5

Answer 2

Answer:

a = 3

Step-by-step explanation:

f(x)=ax+5         //the function f(x) holds ax+5........................(1)

f(1) = 8               //we need to find the value of a         ...........................(2)

comparing the above two...we get x=1

substituting the value(x=1) in equation (1)...we get,

f(1)=a(1)+5       ⇒f(1)=a+5     ................................(3)

from equation (2) and (3) we get...

a+5=8         ⇒a=8-5

so we get the value of a as 3   //the method i have used is to understand the real usage of functions....please try to adapt to it...

hope it helps...

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