Question

What is the inverse of y = 3x + 9?

Answer 1

@iPwnBunnies

Answer 2

To find the inverse of a function. Change places of x and y.
Then, solve for y again.

Answer 3

y=-3 so plug it in now ?

Answer 4

x=-4

Answer 5

What? Did you find the inverse function?

Answer 6

i solved it

Answer 7

By switching places, I mean like this: x = 3y + 9
Then solve for y. That'll be the inverse of the function.

Answer 8

Oh. If the original function has a point at (-4,-3) then the inverse has a point at (-3,-4)

Answer 9

thats what i did, and i got y=-3, then i switched them back and pluged y in to solve for x

Answer 10

thats not one of the answers tho,
the're fractions but none of them have 4 in them

Answer 11

I'm confused now. The instructions just say to find the inverse.

Answer 12

We're not inputting anything in. We're just finding the inverse function.

Answer 13

A. y=1/3x-3
B. y = 9x + 3
C. y=1/3x+9
D. y=-1/3x-3

Answer 14

i think its d

Answer 15

Just find it like the way I showed you.
Original function: y = 3x + 9
Switch variables: x = 3y + 9
Can you rearrange this to solve for y?

Answer 16

so its d

Answer 17

No.

Answer 18

thats the only one with a negative

Answer 19

x - 9 = 3y; divide both sides by 3
x/3 - 3 = y

Answer 20

so its a

Answer 21

Yes

Answer 22

thank you, your awesome !