Vicki sketches and sells portraits at the local zoo. She collects data on the price of her portraits, x, and the number of portraits she sells in a month, y Vicki determines that the relationship between x and y is given by the equation.

y=670 - 23x

Which statement is the best interpretation of the slope of the equation?

The maximum number of portraits Vicko can sell in a month is 670.

The maximum amount of money Vicki can earn in a month is 5670.

Vicki sells 23 fewer portraits each time she increases the price by $1.

Vicki sells 1 fewer portrait each time she increases the price by $23.