Final answer:
The slope of the line represented by the equation y = x + 7 is 1, which corresponds to answer choice D.
Step-by-step explanation:
The graph of a line is given by the equation y = x + 7. To determine the slope of the line, we need to look at the coefficient of the x term in the equation.
The general formula for a straight line is y = mx + b, where m is the slope and b is the y-intercept. In our equation, the coefficient of x is 1, which means the slope of the line is 1. Thus, the correct answer to the student's question is D) 1.