# Math Help - variables

1. ## variables

how do you show your work for 54/y+y=15

2. 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