Answer:
"If there is only one line parallel, then there is only one given line."
Explanation:
The general form of an if-then statement is:
p → q
This implies that: "if p, then q".
Then the converse of this statement is:
q → p
This implies that: "if q, then p".
The statement here is:
"If there is a given line, then there is only one line parallel to it"
The converse of this statement will be:
"If there is only one line parallel, then there is only one given line."