Question

The image of `A(-1, 1)` under a reflection is `A'(-1,-1)`. What reflection produces the image of `A`?

Answer 1

A reflection in the `x`-axis, or equivalently, a reflection in the line `y=0`

Explanation:

If we plot the points on a cartesian coordinate system, the transformation should be clear:

Clearly `A` is transformed to `A'` by a reflection in the `x`-axis, or equivalently, a reflection in the line `y=0`