# What maths topic is this?

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#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
2 years ago
#2
Simultaneous equations
0
#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
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
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
2 years ago
#6
snoitauqE suoenatlumiS
0
2 years ago
#7
(Original post by Your Local Cat)
snoitauqE suoenatlumiS
suoᴉʇɐnbǝ snoǝuɐʇlnɯᴉs
0
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
X

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