Step-1: Evaluating for .
Given, and line is parallel to .
Subtract from each side:
Step-2: Evaluating for .
Step-3: Evaluating for :
Step-4: Evaluating for :
Step-5: Evaluating for .
Step-6: Evaluating for .
Step 7. Evaluating for .
Step-8: Evaluating for .
Step-9: Evaluating for .
Step-10: Evaluating for .
Step-11: Evaluating for .
Step-12: Evaluating for
Hence,