Shannon.Leanne
Badges: 12
Rep:
?
#1
Report Thread starter 2 years ago
#1
I don’t know what the topic is called, can anyone help?

3^x= 9^y-1
and x^2 + 4y^2 = 4
Find the value of y=x
0
reply
3pointonefour
Badges: 17
Rep:
?
#2
Report 2 years ago
#2
Simultaneous equations
0
reply
Shannon.Leanne
Badges: 12
Rep:
?
#3
Report Thread starter 2 years ago
#3
(Original post by 3pointonefour)
Simultaneous equations
No I don’t think that it is because you have 3 to the power of x and 9 to the power of y-1, so how would you even solve that?
0
reply
3pointonefour
Badges: 17
Rep:
?
#4
Report 2 years ago
#4
(Original post by Shannon.Leanne)
No I don’t think that it is because you have 3 to the power of x and 9 to the power of y-1, so how would you even solve that?
Simultaneous equations are just a set of equations with more than one unknown to solve for, since there's 2 different equations and you have to solve for x and y, they are simultaneous equations.

To solve it, try to use the first equation. 9 = 3^2 so use that to get a linear relationship between y and X.

3^x = (3^2)^(y-1)
0
reply
Rolls_Reus_0wner
Badges: 22
Rep:
?
#5
Report 2 years ago
#5
(Original post by Shannon.Leanne)
I don’t know what the topic is called, can anyone help?

3^x= 9^y-1
and x^2 + 4y^2 = 4
Find the value of y=x
Simultaneous Equations
0
reply
4D Chess
Badges: 18
Rep:
?
#6
Report 2 years ago
#6
snoitauqE suoenatlumiS
0
reply
3pointonefour
Badges: 17
Rep:
?
#7
Report 2 years ago
#7
(Original post by Your Local Cat)
snoitauqE suoenatlumiS
suoᴉʇɐnbǝ snoǝuɐʇlnɯᴉs
0
reply
steveeem
Badges: 14
Rep:
?
#8
Report 2 years ago
#8
(Original post by Shannon.Leanne)
I don’t know what the topic is called, can anyone help?

3^x= 9^y-1
and x^2 + 4y^2 = 4
Find the value of y=x
simultaneous equations with logs
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Should there be a new university admissions system that ditches predicted grades?

No, I think predicted grades should still be used to make offers (671)
33.65%
Yes, I like the idea of applying to uni after I received my grades (PQA) (847)
42.48%
Yes, I like the idea of receiving offers only after I receive my grades (PQO) (385)
19.31%
I think there is a better option than the ones suggested (let us know in the thread!) (91)
4.56%

Watched Threads

View All
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise