The coordinates of B'of A', B', C' for a reflection across line RM are B' = (2, -3)
How to determine the coordinates of B'of A', B', C' for RM
From the question, we have the following parameters that can be used in our computation:
B = (2, 9)
And, we have the line of reflection to be
y = 3
This means that we reflect B (2, 9) to get B'
When reflected, the x-coordinates remain unchanged, while the y-coordinate changes as follows
B' = (2, 3 - (9 - 3))
Evaluate
B' = (2, -3)
Hence, the coordinates of B'of A', B', C' for RM are B' = (2, -3)
Question
Suppose the equation of line m is y = 3.
What are the coordinates of B' of A', B', C' for RM