For a certain manufacturer, the production and sale of each additional unit yields an additional profit of

Question:

For a certain manufacturer, the production and sale of each additional unit yields an additional profit of $10. The sale of 1000 units yields a profit of $4000.
(a) Find the profit equation.
(b) Find the y- and x-intercepts of the graph of the profit equation.
(c) Draw the graph of the profit equation.