Given the lines AB and CD, determine the slope of line CD. Type a numerical answer in the space provided. If necessary, use the /key to represent a fraction bar. Do not put spaces in your answer.

Damon makes 20 cups of lemonade by mixing lemon juice and water. the ratio of lemon juice to water is shown in the tape diagram. lemon juice\text{lemon juice} lemon juice water\text{water} water how much lemon juice did damon use in the lemonade? cups