How do you solve this ? For the function f(x) given by the set of ordered pairs below, find f(3).

{ (3,6), (14,-3), (-3,3) }

Question

How do you solve this ? For the function f(x) given by the set of ordered pairs below, find f(3).  

{ (3,6), (14,-3), (-3,3) }

jim_thompson5910 · Answer

f(3) is the same as saying "the value of y when x = 3"

x = 3 is the input of the function
all of "f(3)" is the output of the function when x = 3

solomonzelman · Answer

where do you see the x-coordinate three? in which of the points?

anonymous · Answer

3,6

solomonzelman · Answer

Yes.

solomonzelman · Answer

Any point (a,b) is saying that when x=a, then y=b

And so is (3,6) saying the same exact thing.
when x=3, y is equal to ?

anonymous · Answer

6

solomonzelman · Answer

yes.

solomonzelman · Answer

when you say
` f(3) `, you are trying to find the "y" when x=3.


`(keep in mind your point (3,6)   )`

So when they ask you `find f(3)`, they just wnat the value of y, when x=3.

solomonzelman · Answer

what is this value of y when x=3 ?

anonymous · Answer

6

solomonzelman · Answer

yes, and that exactly means that f(3)=6

solomonzelman · Answer

just like anytime, when you have a point  (a,b)
that is same as saying
f(a)=b

anonymous · Answer

so I don't need to do anything to the other points?

solomonzelman · Answer

no

solomonzelman · Answer

(they are just there to confuse you)

solomonzelman · Answer

$\LARGE\bf\rlap{\color{red}{L\ o\ l!}}{\color{blue}{\; {L\ o\ l!}}}$

anonymous · Answer

Thank you c:

solomonzelman · Answer

Yes, tried to be accessible (and apparently I was able to).
Don't like helpless "wierd" definitions no matter how precise they are... yw!