Question

WILL MEDAL
Triangle ABC is congruent to triangle DEF. In triangle ABC, side AB measures 9, side BC measures 3x+1, and side CA measures 7. In triangle DEF, side DE measures 9, side EF measures 2x+2, and side FD measures 7. What equation would help you to solve for the side length of BC and EF? Explain your reasoning using complete sentences.

Answer 1

Side BC in triangle ABC would correspond with side EF in triangle DEF so we can set them equal to each other.

3x + 1 = 2x + 2