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

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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
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$\tiny{6.5.95 Kamehameha HS}$

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
 
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  • #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
 

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

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.

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.

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.

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.

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.

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