What is the length of segment AB if the coordinate of point A is -3, and point M (1) is the midpoint of segment AB?

A (x1) = A (-3);

M (x2) = M (1);

| AB | -?

1. | AM | = | x2 – x1 | = | 1 – (-3) | = 4 – the length of half of the segment AB;

2. | AB | = 2 * AM = 2 * 4 = 8 cm – the length of the segment AB.

Answer: 8 centimeters.

Explanation: Find half of the segment AB, for this we subtract the coordinate of the beginning of AB from the coordinate of the middle point AB, and take this value modulo. Multiply the resulting number by 2. Write down the answer.