Please help, I'm begging​

Do not comment if you aren’t going to . create a real-life situation and create a system and show how it might be modeled algebraically with a system of equations (or inequalities) show all work include a few sentences explaining the situation, your variables of choice and what each represents, and how you would set it up and solve it algebraically. !

In the figure shown below, m < 40 and ab =8. which equation could be used to find x?

Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?