Question

Let B be the midpoint of AC. If AB = 2x + 6, and BC = 4x - 10, what is the measure of AB?

Answer 1

A---------B---------C

the measure of AB equals the measure of BC

2x+1=3x-4

4+1=3x-2x

5=x

BC=3x-4=3*5-4=15-4=11

AB=2x+1=2*5+1=10+1=11

AC=AB+BC=11+11=22

not sure

Answer 2

AC = AB + BC

AC = 2x + 6 + 4x - 10

AC = 6x - 4

If B is the middle point of AC

AB = AC/2 = (6x - 4)/2 = 3x - 2