If <6 = <10 and <5– <7, which describes all the lines that must be parallel? S
5/6
8/7
1 / 2
4/3
13/14
16/15
9/10
12/11
O Only lines r and s must be parallel.
O Only lines t and u must be parallel.
O Lines r and s and lines tand u must be parallel.
O Neither lines rand s nor lines t and u must be parallel.