If two lines are parallel, which statement must be true?
a. their slopes are reciprocals.
b. their slopes are opposites.
c. their slopes are equal.
d. their slopes are negative reciprocals.

C. Their slopes are equal.

Step-by-step explanation:

Given : If two lines are parallel.

To find  : which statement must be true.

Solution : We have given that If two lines are parallel.

We know that two parallel line have same slope

By rise over run :

Therefore, C. Their slopes are equal.

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