Answer:
See below.
Explanation:
We are asked to identify the Proof for Statement 7.
To start, we already have 2 sides and 1 angle proven, meaning that we can prove ΔABX ≅ ΔABY by the Side-Angle-Side Triangle Congruency Theorem. (SAS).
Because both Triangles are congruent, every side, and angle of the triangles are congruent. ASA, and SAS are incorrect choices, they're only used to prove that 2 triangles are congruent. HL is incorrect as well, the HL (Hypotenuse - Leg Theorem) is only used to prove that 2 triangles are congruent also. Our only option is CPCTC (Corresponding parts of congruent triangles are congruent); Meaning that every angle and every side of the 2 triangles are congruent.
For Statement 7, AX ≅ AY proved by CPCTC.