Answer:
AB=7
Explanation:
You have to graph the segment, it would be AB is equal to "x+19" and BC is equal to "x+13" and all those segments are equal to 8, it would be an equation:
x+19+x+13=8
2x+32=8
2x=8-32
2x=-24
x=-12
To find AB we have to substitute the X for -12, it would look like this: -12+19, in the end it would give 7, which means that all that segment "AB" is equal to 7.