Question

PLEASE HELP WILL GIVE MEDAL . given that (-9,3) is on the graph of f(x) find the corresponding point for the function f(-3x)

Answer 1

Have you tried an example?

f(x) = ax
f(-9) = -9a = 3 ==> a = 3/-9 = -1/3 ==> f(x) = (-1/3)x
f(3x) = (-1/3)(3x) = -x

Is it the same for ALL such functions, given only the one point?
g(x) = x + b
g(-9) = -9 + b = 3 ==> b = 12 ==> g(x) = x + 12
g(3x) = 3x + 12

Looks to me like you have some variation on your hands.

Answer 2

i have no clue what i'm doing

Answer 3

you don't have very much info, so this should be relatively simple

Answer 4

i'm horrible at math and could use some help

Answer 5

@hayhayz

Answer 6

@johnweldon1993

Answer 7

You have the point (-9,3) which means
f(-9) = 3
the corresponding point means you need to find the x-value so that:
f(-3x) = 3

Any idea...?

Answer 8

i still don't really get it, But would f(-3x)=3 be the answer @agent0smith

Answer 9

No.

f(-9) = 3

f(-3x) = 3

Stare at both of those for a few seconds. See if you can figure out what x needs to be, for them to be the exact same thing.

Answer 10

@agent0smith

Answer 11

would it be 3,3 ?

Answer 12

x = 3
that is the only way it would work

Answer 13

@agent0smith @TGstudios

Answer 14

iv sorta got it down, how do i know whether the point is on the y or x axis

Answer 15

how do i know whether it goes in the y or x direction

Answer 16

Your last two questions are entirely unrelated to this question.

If a point is on the x axis, it'll look like (x, 0) (ie the y value will be 0)

If a point is on the y axis, it'll look like (0, y) (ie the x value will be 0)


"how do i know whether it goes in the y or x direction" I don't really know what you're asking.