Exercise 7 Page 371

Next, we find -1 on the y-axis and follow this grid line until it collides with the grid line from our x-coordinate. The y-coordinate -1 tells us to move 1 unit down from the origin — the negative vertical direction.

The point ( -2.5, -1) lies on the point at which these two grid lines intersect. Now we want to describe the location of this point. Recall what we know about the quadrants of a coordinate plane. The coordinate plane is divided into four quadrants by the x- and y-axes.

The point (-2.5,-1) has two negative coordinates. The quadrant where both the x- and y-coordinates are negative is the third quadrant, or Quadrant III. Therefore, the point is located in Quadrant III.