Question

What is the rule of the reflection

Answer 1

The third one is the answer

Answer 2

Answer: $r_{y-axis}(x,y)\rightarrow(-x,y)$

Step-by-step explanation:

From the given picture, it cam be seen that the two triangles are reflection of each other.

Such that their corresponding x coordinate has different sign but same magnitude and the corresponding y-coordinate remains unchanged.

Thus, the reflection must be reflection across y-axis.

The rule of the reflection across y-axis is given by:-

$r_{y-axis}(x,y)\rightarrow(-x,y)$