Question

s is the image of the point s after a reflection.
s(3, -1) → s(3, 1)
over which axis was point s reflected?
x-axis
y-axis

Explanation:

When a point $(x, y)$ is reflected over the x-axis, its image becomes $(x, -y)$. Here, the original point $S(3, -1)$ maps to $S'(3, 1)$, which matches the x-axis reflection rule (the x-coordinate stays the same, and the y-coordinate is negated). A reflection over the y-axis would change the x-coordinate's sign, which did not happen here.

Answer:

x-axis