How Can You Rewrite an Equation to Express y as a Function of x?

  • MHB
  • Thread starter karush
  • Start date
  • Tags
    Function
In summary, we discussed rewriting a given equation to express y as a function of x. We applied the properties of logarithms to simplify the equation and isolate y, resulting in the expression $ln(y)= \ln\left(\frac{C(2x+1)^{1/6}}{(x+ 4)^{1/9}}\right)$. This approach proved to be more efficient and less complicated than the initial attempt.
  • #1
karush
Gold Member
MHB
3,269
5
$\tiny{6.5.95 Kamehameha HS}$

Express y as a function of x. $\quad C>0$
$3\ln{y}=\dfrac{1}{2}\ln{(2x+1)}-\dfrac{1}{3}\ln{(x+4)}+\ln{C}$
rewirte as
$\ln{y^3}=\ln{(2x+1)^{(1/2)}}-\ln{(x+4)^{(1/3)}}+\ln{C}$
then e thru and isolate y
i think
looks like it will be ugly
 
Mathematics news on Phys.org
  • #2
$y = \dfrac{C_2\sqrt[6]{2x+1}}{\sqrt[9]{x+4}}$
 
  • #3
karush said:
$\tiny{6.5.95 Kamehameha HS}$

Express y as a function of x. $\quad C>0$
$3\ln{y}=\dfrac{1}{2}\ln{(2x+1)}-\dfrac{1}{3}\ln{(x+4)}+\ln{C}$
rewirte as
$\ln{y^3}=\ln{(2x+1)^{(1/2)}}-\ln{(x+4)^{(1/3)}}+\ln{C}$
I would have said, instead,
$ln(y)= \ln((2x+1)^{1/6})- \ln((x+4)^{1/9})+ ln(C)$
and then use the properties of the logarithm
$ln(y)= \ln\left(\frac{C(2x+1)^{1/6}}{(x+ 4)^{1/9}}\right)$

then e thru and isolate y
i think
looks like it will be ugly
Now, it doesn't look so ugly!
 
  • #4
well that certainly helped a lot
pays to get more input
 

1. How do you write y as a function of x?

To write y as a function of x, you can use the notation y = f(x), where f is the function and x is the independent variable. This means that the value of y depends on the value of x.

2. What does it mean to write y as a function of x?

Writing y as a function of x means that y is expressed as a mathematical relationship with x. This allows us to determine the value of y for any given value of x.

3. Can you provide an example of writing y as a function of x?

Sure, an example of writing y as a function of x is y = 2x + 3. This means that for any value of x, the value of y is equal to 2 times x plus 3.

4. How is writing y as a function of x useful in science?

Writing y as a function of x is useful in science because it allows us to model and predict relationships between variables. This can help us understand and explain natural phenomena, and make predictions for future experiments.

5. Is it always possible to write y as a function of x?

No, it is not always possible to write y as a function of x. In some cases, the relationship between y and x may be too complex to be expressed as a function. In these cases, other mathematical techniques may be used to model the relationship between the variables.

Similar threads

  • General Math
Replies
6
Views
820
  • General Math
Replies
5
Views
867
  • General Math
Replies
1
Views
750
  • General Math
Replies
11
Views
400
Replies
2
Views
864
  • General Math
Replies
3
Views
745
  • General Math
Replies
1
Views
666
  • General Math
Replies
1
Views
2K
  • Differential Equations
Replies
16
Views
893
Back
Top