Is the greatest common factor of two even number always even

What is the equation of the line shown in this graph?

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. !

10% of 1,900,000. show me how you got the answer