# Math Help - Graphing Functions

1. ## Graphing Functions

Does anyone know how to go about graphing the following functions?

f(x) = 72/x
0< x < 12 and 0< y < 72

AND

g(x) = log2/log(1+ x/100)

0< x < 12 and 0< y < 72

Thank you!

2. Originally Posted by Yepper
Does anyone know how to go about graphing the following functions?

f(x) = 72/x
0< x < 12 and 0< y < 72

AND

g(x) = log2/log(1+ x/100)

0< x < 12 and 0< y < 72

Thank you!
Choose a number of values of x between 0 and 12, calculate the corresponding y, and plot the points (x,y). Have you tried that?

3. Hello
for the second one, $\frac{\log2}{\log(1+\frac{x}{100})}=\log(1-\frac{x}{100})$ might help you

4. Originally Posted by Raoh
Hello
for the second one, $\frac{\log2}{\log(1+\frac{x}{100})}=\log(1-\frac{x}{100})$ might help you
What?

You seem to think that $\frac{log(a)}{log(b)} = log(a-b)$, whereas the correct identity is $log(\frac{a}{b}) = log(a) - log(b)$

The RHS isn't even defined for $x \geq 100$, whereas for the LHS it is defined for $x > -100$...

5. Originally Posted by Defunkt
What?

You seem to think that $\frac{log(a)}{log(b)} = log(a-b)$, whereas the correct identity is $log(\frac{a}{b}) = log(a) - log(b)$

The RHS isn't even defined for $x \geq 100$, whereas for the LHS it is defined for $x > -100$...
Désolé,sorry,اسف..
indeed you're right ,i missed up .
thanks