Answer:
[tex]\huge\boxed{IJ = 9}[/tex]
Step-by-step explanation:
Given that J is on line segment IK.
So, it is like:
I______?_______J___6___K
|<--------------------15---------------->|
We know that:
IK = IJ + JK
Where IK = 15 and JK = 6
15 = IJ + 6
Subtracting 6 to both sides
IJ = 15 - 6
IJ = 9
