Final answer:
The correct equation for the blue line is y = -2x + 4.
Step-by-step explanation:
The correct equation for the blue line is y = -2x + 4 (option A). This equation represents a linear equation in the form y = mx + b, where m is the slope and b is the y-intercept. In this case, the slope is -2 and the y-intercept is 4.