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# Help ! watch

1. Okay, this may be an easy question for most A-Level students but i’m only 13 ok

9^(3x-6) = (1/3)^y

Find an equation for y

Use your answer to solve these simultaneous equations:
9^(3x-6) = (1/3)^y
and
y = 2x + 4

Pls help idgi
2. bump
3. (Original post by frankielogue)
Okay, this may be an easy question for most A-Level students but i’m only 13 ok

9^(3x-6) = (1/3)^y

Find an equation for y

Use your answer to solve these simultaneous equations:
9^(3x-6) = (1/3)^y
and
y = 2x + 4

Pls help idgi
Try to make both sides have the same base

e.g.if you had this:

Yours is harder than this example but see if you can use a similar method. Post your working/thoughts if you get stuck.
4. (Original post by notnek)
Try to make both sides have the same base

e.g.if you had this:

Yours is harder than this example but see if you can use a similar method. Post your working/thoughts if you get stuck.
Not sure if this is 100% correct but I got

Is this correct?
5. (Original post by frankielogue)
Not sure if this is 100% correct but I got

Is this correct?
I don't know if you've finished editing your latex but you've made a mistake in changing into . The has disappeared.

You should use 'preview post' before posting to check your latex looks okay.
6. (Original post by notnek)
I don't know if you've finished editing your latex but you've made a mistake in changing into . The has disappeared.

You should use 'preview post' before posting to check your latex looks okay.
isn’t -1 * y = -y?
7. (Original post by frankielogue)
isn’t -1 * y = -y?
It is but your has disappeared. Correct version:

8. (Original post by notnek)
It is but your has disappeared. Correct version:

Ohhh I see😂 Do you then solve :

to get the answer for y? this was my main problem - not sure what to do next
9. (Original post by frankielogue)
Ohhh I see😂 Do you then solve :

to get the answer for y? this was my main problem - not sure what to do next
The question wants you to find an equation for y in terms of x. You just need to divide both sides by -1 and then you're done.

If you had already reached this point when you asked this question then you should have posted all your working at the start.
10. (Original post by notnek)
The question wants you to find an equation for y in terms of x. You just need to divide both sides by -1 and then you're done.

If you had already reached this point when you asked this question then you should have posted all your working at the start.
My bad. I see that but I don’t get the simultaneous equations part.
11. (Original post by frankielogue)
My bad. I see that but I don’t get the simultaneous equations part.
You've changed 9^(3x-6) = (1/3)^y into a simple linear equation. So now you have two linear equations which you can solve in the normal way.
12. (Original post by frankielogue)
Okay, this may be an easy question for most A-Level students but i’m only 13 ok

9^(3x-6) = (1/3)^y

Find an equation for y

Use your answer to solve these simultaneous equations:
9^(3x-6) = (1/3)^y
and
y = 2x + 4

Pls help idgi
A-level Mathematics actually scares me. So glad i won't have to take it.
13. (Original post by notnek)
You've changed 9^(3x-6) = (1/3)^y into a simple linear equation. So now you have two linear equations which you can solve in the normal way.
No you have to solve these equations:
9^(3x-6) = (1/3)^y
2x + 4

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