Someone help me with this question

Question

beccaboo333 · Answer

There's no question?

jewlzme17 · Answer

what question?

anonymous · Answer

For the function f(x) = 3x + 3, find x such that f(x) = 18
 A. 6
 B. 57
 C. 5
 D. 3

the_fizicx99 · Answer

Well plug in a x value, f(6) = 3(6) + 3 = 21

the_fizicx99 · Answer

It's not A :) You try

anonymous · Answer

what

nikato · Answer

Plug in 18 for x in 3x+3

the_fizicx99 · Answer

._. I don't think thats what're asking for @nikato .. f(x) has to = 18

anonymous · Answer

@lanK16 can u hellp

the_fizicx99 · Answer

"find x such that f(x) = 18 is implying that a x value will equal 18

the_fizicx99 · Answer

By pluging in 5, you get f(3) = 3(5) + 3 

3*5 = 15

15 + 3 = 18

f(5) = 18

nikato · Answer

Oh nvm it's,

18=3x+3
And ur tryin to solve for x

jewlzme17 · Answer

you know that f(x)= 18 so now just plug it into the equation and then you can solve for 3x+3 which would then come out to be 18 = 3x + 3...if i am correct? then all you now would need to do is solvw which would be
3x +3=18
     -3   -3
3x = 15
/3      /3
x=5

the_fizicx99 · Answer

You could also do that lol

18 = 3x + 3
-3           -3

15 = 3x
/3     /3

x = 5 :>

usukidoll · Answer

The answer is rabbits ^^

nikato · Answer

1. Subtract 3 on both sides.
2.divide 3 on both sides