Question (a)
The relationship between satisfaction score and salary is a positive one. The graph shows a positive correlation. It means, the higher the salary, the higher the satisfaction score
Question (b)
We will substitute the value of
into the equation 
Question (c)
The constant 0.0005 is the increase of satisfactory score by 0.0005 for every pound increase in the salary
The relationship between satisfaction score and salary is a positive one. The graph shows a positive correlation. It means, the higher the salary, the higher the satisfaction score
Question (b)
We will substitute the value of
Question (c)
The constant 0.0005 is the increase of satisfactory score by 0.0005 for every pound increase in the salary