How to use the congruence of parallel lines to determine the missing value

The video tutorial explains the concept of parallel lines and congruent parts, emphasizing that lines parallel to each other have equal measurements. It demonstrates how to set up and solve equations using these principles, reinforcing the understanding of congruency in geometry.

Explain the process of solving the equation 3Y - 8 = Y + 5.

What is the significance of leaving the answer as a fraction in the context of this lesson?