An online company sells handmade samurai katana swords. The website costs $ 140 a month to maintain. Each katana costs $ 215 to make, and they sell each katana for $ 555.

A. Create a linear model in the form $y = m x + b$ where $x$ is the number of swords sold per month and $y$ is the net monthly profit.


B. Using this model, find the number of swords that would need to be sold per month to have a monthly profit of $ 4360.