Line B is described as a decreasing line, indicating it has a negative slope. A negative slope means that as x increases, y decreases, which is graphically represented by a line falling from left to right.
In searching for the line with a negative slope, we should remember that a negative slope indicates a relationship where, as the value of x increases, the value of y decreases. A graphical representation of a negative slope shows a line that falls as it moves from the left to the right.
Given the options, we would look for a line that demonstrates this downward trend. The information given suggests that Line A is increasing, which rules it out. Line B, on the other hand, is described as a decreasing line, which implies that it has a negative slope. Therefore, the correct answer would be Line B.