At least how many bikes need to be sold to produce a profit?

I know the answer; hope you have an awesome day.

Step-by-step explanation:

You deserve this. Report me. This is how other people feel when you steal their hard-earned points.

The number of orders in are linearly related to the month
and the number of orders out. are linearly related to the month:

y = 2 x , where y is the number of orders in, and x is the number of the month

z = x + 2, where z is the number of orders out, and x is the number of the month.