Chapter 1: Q1 (page 24)
Theorem 1-1 states that two lines intersect at exactly one point. The diagram suggests what would happen if you tried to show two 鈥渓ines鈥 drawn through two points. State the postulate that makes this situation impossible.

Short Answer
The postulate that makes the situation impossible is 鈥淭he postulate 6 which states that through any two points there is exactly one line.鈥




