Answer:
Step-by-step explanation:
Alright, lets get started.
Please refer the diagram I have attached.
I have reflected the triangle over the red line in the diagram.
New triangle is A'B'C'.
As we can see, in original diagram, point B is 4 units to the right of the line.
So, once we get its reflection, point B' will be, 4 units to the left of the line.
Hence, B' will be 4 units to the left of the line. : Answer
