Question

What is the axis of symmetry of the parabola given by the equation x = 3(y – 9)2 – 12?

Answer 1

Answer choices:
x = –9

x = 9

y = –9

y = 9

Answer 2

PLEASE HELP ME! I need help! I have been working on this assignment for 3 hours!

Answer 3

Have a look here to see how expressing the equation of a parabola in vertex form gives you where the axis of symmetry lies: http://www.mathwarehouse.com/geometry/parabola/standard-and-vertex-form.php

Answer 4

im still really confused

Answer 5

the equation you are given is:\[x = 3(y – 9)^2 – 12\]if you look at that link I gave, what does this tell you about where the vertex of this parabola is?

Answer 6

The vertex is 9,12

Answer 7

9, -12

Answer 8

not quite, remember here the x and y coordinates have been swapped - and also pay particular attention to the signs.

Answer 9

But it says that where the 9 is thats h and where the -12 is thats k. So isnt 9,-12 the vertex?

Answer 10

Unless I read that wrong

Answer 11

WAIT is the axis of symmetry x=9?

Answer 12

the site lists the equation as:\[y=a(x-h)^2+k\]what you are given is more like:\[x=a(y-h)^2+k\]i.e. the x and y coordinates have been swapped

Answer 13

is it x=9!?

Answer 14

no y=9?

Answer 15

which one would you bet your house on? :)

Answer 16

y=9?

Answer 17

but truthfully neither aha

Answer 18

damn - I was soooo close to winning your house! :D

Answer 19

I got it right!?

Answer 20

y=9 is the correct answer :)

Answer 21

Can you please help me with another one!?

Answer 22

I have been working on this assignment for 3 hours and I have to be done in 10 minutes :(

Answer 23

AND THANKYOU SO MUCH!

Answer 24

I am doing some other work as well right now - so just post your question and I'll take a look if no one else has helped by then...

Answer 25

yw :)

Answer 26

okay thankyou!

Answer 27

np