Question

an algebraic rule of (x, y) → (x, -y) is reflection across the choose your answer... y - axis x - axis previous

Explanation:

Step1: Recall reflection rules

In a coordinate - plane, for a point $(x,y)$, reflection across the x - axis changes the sign of the y - coordinate.

Step2: Analyze the given rule

The rule $(x,y)\to(x, - y)$ changes the sign of the y - coordinate while keeping the x - coordinate the same.

Answer:

x - axis