Question

what is the rule for the reflection? y - axis (x, y) → (x, y) y - axis (x, y) → (-x, y) y - axis (x, y) → (-x, y) y - axis (x, y) → (x, -y)

Explanation:

Step1: Recall reflection rule

For a reflection across the y - axis, the x - coordinate of a point $(x,y)$ changes sign while the y - coordinate remains the same.

Step2: Analyze given points

For example, if a point $(x,y)$ is reflected across the y - axis, it becomes $(-x,y)$.

Answer:

$(x,y)\to(-x,y)$