The triangle that represents the reflection of the pre-image across the line x = 1 is triangle B
When a triangle is reflected across a line, the triangle is flipped across the line.
Line x = 1 is a vertical line that passes through point x = 1
From the question, the image of the triangle is fully in the first quadrant.
When reflected, the image will be fully in the second quadrant
Hence, the triangle that represents the reflection of the pre-image across the line x = 1 is triangle B
Read more about transformation at:
https://brainly.com/question/4289712
