# Math Help - Expression problem

1. ## Expression problem

Hi there

im having problems trying to make p the subject, because p is on the top and bottom of the RHS;

Z=(pq)/p-q

any ideas, also, what kind of problem is this?

Hi there

im having problems trying to make p the subject, because p is on the top and bottom of the RHS;

Z=(pq)/p-q

any ideas, also, what kind of problem is this?
solving a literal equation for a variable ...

$\displaystyle z = \frac{pq}{p-q}$

$z(p-q) = pq$

$zp-zq=pq$

$zp-pq=zq$

$p(z-q)=zq$

$\displaystyle p=\frac{zq}{z-q}$

3. thanks, i was pretty close and got down to the third line,
however i messed up my transpostion after that, now its ok, i see now they swap to make 'zq' the subject..kk
"simples" after that!