Question

what is the length of $overline{bc}$?

Explanation:

Step1: Identify coordinates

The coordinate of point B is - 1 and the coordinate of point C is 1.

Step2: Use distance formula

The distance between two points \(x_1\) and \(x_2\) on a number - line is \(d=\vert x_2 - x_1\vert\). Here, \(x_1=-1\) and \(x_2 = 1\), so \(d=\vert1-(-1)\vert\).

Step3: Simplify the expression

\(\vert1 - (-1)\vert=\vert1 + 1\vert=\vert2\vert = 2\).

Answer:

2