Graphing to the ISS

Write a linear equation in slope-intercept form (y = mx + b) to represent the path of the flight from Kennedy Space Center to the ISS. (Note: you can check your equation by typing into the input bar and making sure it lines up with the path of the rocket)

What does x represent in this equation?

What does y represent in this equation?

What are the coordinates of the y - intercept and what does it represent in the context of the problem?