# variables

• Jun 12th 2008, 05:45 PM
rambow30
variables
how do you show your work for 54/y+y=15
• Jun 12th 2008, 06:09 PM
topsquark
Quote:

Originally Posted by rambow30
how do you show your work for 54/y+y=15

$\frac{54}{y} + y = 15$

Multiply both sides by y:
$54 + y^2 = 15y$

$y^2 - 15y + 54 = 0$

$(y - 6)(y - 9) = 0$

So y = 6 or 9.

-Dan