Question

Find the value of x so that the function has the given value. f(x) = 6x+9; f(x)=21

Answer 1

Answer: =135

Step-by-step explanation:

f(x) = 6(21)+9

f(x)= 135

Answer 2

Answer:

$x=2$

Step-by-step explanation:

Our answer is 2, this is how we know.

First, we work backward:

$21-9=12$

$12$ ÷ $6=2$

Now we check our answer:

we need to substitute 2 into x:

$f(x)=6(2)+9$

then we solve:

$f(x)= 12+9$

$f(x)=21$

Therefore,

$x=2$

Brainliest is appreciated!