cost function and break even

Question

 saved up 15000 to open a business and this covered the initial investment of rent, labor, and patents. Supplies for each product cost $7.00 and sell them for $18 let x represent numbers of products and write the cost and revenue function and the break even point

Answer 1

1) Cost = initial investment + recurring supply costs:

Cost = $15,000 + $7x

2) Revenue = (Sale price of each product)(Number of products sold):

Revenue = $18x

3) You "break even" when the revenue equals your costs:

Revenue = Cost

18x = 15,000 + 7x

Solve for x, the number of products you need to sell to break even. Round t the nearest whole unit (number).