The page p in a book and the weight w of the book

2(n-1)+4n=2(3n-1)n=0no solutioninfinitely many solutions n= - 4 !

Which is a graph of a proportional relationship?

If set d is not the empty set but is a subset of set e, then which of the following is true? d ∩ e = d d ∩ e = e d ∩ e = ∅