Question

vertical segments

1. practice: making mental images and summarizing

the endpoints of a segment are (0, 10) and (0, 20).
how do you know it is a vertical segment?
the segment is vertical because the x - coordinates of its endpoints (0,10) and (0,20) are equal.

Explanation:

In a coordinate - plane, a vertical segment has endpoints with the same x - coordinate. Here, the endpoints of the segment are (0, 10) and (0, 20), which have equal x - coordinates (both are 0). So, we know it is a vertical segment because of this property of equal x - coordinates for endpoints.

Answer:

We know it is a vertical segment because the x - coordinates of its endpoints are equal.