# Math Help - solving for X

1. ## solving for X

can someone help with next step? plz

2. Originally Posted by realistic
can someone help with next step? plz
y=p/(k-x)

3. back of book has a different answer

4. Hello realistic
Originally Posted by realistic
can someone help with next step? plz
$x = k - \frac{\sqrt{pz}}{y}$

$\Rightarrow x-k=-\frac{\sqrt{pz}}{y}$

$\Rightarrow k-x=\frac{\sqrt{pz}}{y}$

$\Rightarrow (k-x)y=\sqrt{pz}$

$\Rightarrow y = \frac{\sqrt{pz}}{k-x}$

Grandad

5. Originally Posted by Grandad
Hello realistic $x = k - \frac{\sqrt{pz}}{y}$

$\Rightarrow x-k=-\frac{\sqrt{pz}}{y}$

$\Rightarrow k-x=\frac{\sqrt{pz}}{y}$

$\Rightarrow (k-x)y=\sqrt{pz}$

$\Rightarrow y = \frac{\sqrt{pz}}{k-x}$

Grandad
on step 2 how did you get the negative away ?

6. Hello realistic
Originally Posted by realistic
on step 2 how did you get the negative away ?
Multiply both sides by $-1$, noting that $-(x-k) = k-x$.

Grandad