Ross sells 100 shirts at a price of $40 each. They find that if they increase the shirt price by $1, the number of shirts sold drops by 3.

Find an equation in the form $\displaystyle {y}={m}{x}+{b}$ that models the shirt sales, where $\displaystyle {x}$ is the price of a shirt and $\displaystyle {y}$ is the number of shirts sold.

Answer: $\displaystyle {y}=$ Preview Question 6