Question

Which of the following statements is true about the slopes of two parallel lines?

• A. Product of the slopes $=1$
• B.
  Product of the slopes $=-1$
• C. The slopes are equal.
• D. The slopes are different.

Answer 1

The correct option is C The slopes are equal.

The slopes of two parallel lines are equal. Note that two lines are parallel if their slopes are equal and they have different y-intercepts.