The slope would be undefined and it would be wrote as (0,0)
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I suggest listing the digital sources you're asking about so people know what exactly you're referring to and can help you easier with this.
Answer:
In Act I, Anne Frank’s father visits the attic where his family and four others hid from the Nazis during World War II. As he holds his daughter’s diary, Anne’s offstage voice draws him into the past as the families begin their new life in hiding. As the months drag on, fear and lack of privacy in the attic rooms contribute to increasing tension among the family members.
Explanation: