When you first start out you should expect to make less money than you will later because?

Well due to lack of effective advertising and no expertise or experience in the field you shouldn’t expect major profit.However when you get more experienced and build a name for your company you will make more profits.
You can get more share capital ect

For the y-intercept equation, the x will always be 0. And vice versa.

20y = 1800
Divide by 20 on both sides

y = 90

15x = 1800
Divide 15 on both sides

x = 120