Solve the Problem $\$ 3$ Per Item Then 7 Items Are Sold

Multiple Choice

Solve the problem. Write all linear equations in slope-intercept form.
-Suppose that a sales person observes that if an item is priced at $\$ 3$ per item then 7 items are sold. If 5 items are sold for $\$ 5$ per item then find a linear equation to model the number $y$ of items sold for $x$ dollars per item. Find the slope-intercept form of the equation of the line.

A) $y = - x + 4$
B) $y = - x + 10$
C) $y = x + 10$
D) $y = x + 4$