In this diagram WQ = AC. One way to prove this is true is to draw a line through B such that BDAC. Then prove triangle ABC is congruent to triangle DCB, and use corresponding parts of the two triangles. Explain why triangle ABC is congruent to triangle DCB.

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.