A company's profit, in thousands of dollars, can be modeled by a linear function of the number of units sold. When 100 units are sold, the profit is $15,000. When 250 units are sold, the profit is $30,000. What is the meaning of the slope of the graph of this function?
The initial profit when no units are sold
The profit generated for each unit sold
The number of units sold to break even
The maximum profit the company can make
