If an increase in x the variable on the horizontal axis) from 6 to 8 units causes a decrease in y the variable on the vertical axis) from 4 to 3 units, the slope equals
A) 1/2.
B) -1/2.
C) -2.
D) 2.

Question

Quizplus · Accepted Answer

The slope of a line is the change in y divided by the change in x. In this case, the change in x is 8-6 = 2 and the change in y is 3-4 = -1. So the slope is (-1)/(2), which simplifies to -1/2. Therefore, the correct answer is choice B.

If an Increase in X the Variable on the Horizontal