The data in the table represent a linear relationship. Table giving values of y corresponding to x. They are (0, 5), (10, 12.5), (20, null), (null, 27.5), and (40, null).

Cherie works in retail and her weekly salary includes commission for the amount she sells. the equation s=400+0.15c models the relation between her weekly salary, s, in dollars and the amount of her sales, c, in dollars. interpret the slope of the equation.