Answer: [tex]r_{y-axis}(x,y)\rightarrow(-x,y)[/tex]
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:-
[tex]r_{y-axis}(x,y)\rightarrow(-x,y)[/tex]
