Final answer:
The graph of y = 7 is a horizontal line that represents no rise and an infinite run, intersecting the y-axis at the point (0,7).
Step-by-step explanation:
The graph of y = 7 represents a horizontal line. In the context of the equation y = a + bx, where b is the slope and a is the y-intercept, the equation y=7 has a slope of 0 because it does not change as x changes, which means there is no rise over run. It is a horizontal line that intersects the y-axis at 7. Therefore, the correct answer to the question is option b: A horizontal line with no "rise" and infinite "run".
This means that the value of y remains constant at 7 for all values of x. Hence, the line extends infinitely to the left and right along the line y = 7. This is in contrast to a vertical line which would have an undefined slope and extend infinitely up and down.