Final answer:
The slope of the statement, which represents the number of books Kyle reads per month, is 6. This means for each month during the summer, Kyle's total books read increases by 6.
Step-by-step explanation:
The concept being asked about is related to understanding how the slope of a line works in the context of a real-life situation. In Kyle's case, if he is reading 6 books per month throughout the summer, and started with 3 books already read, this scenario can be represented by a straight line on a graph where the horizontal axis (x-axis) represents time in months, and the vertical axis (y-axis) represents the total number of books read. Since the slope of a line indicates how much the y value (number of books) changes for every unit increase in the x value (time in months), and in Kyle's case, the number of books increases by 6 for every month, the slope of this statement is 6.