Question

a figure is reflected across the y - axis. what happens to its x - coordinate? a) it remains the same b) it becomes the opposite sign c) it becomes positive. d) it changes randomly.

Explanation:

When a point $(x,y)$ is reflected across the y - axis, the transformation rule is $(x,y)\to(-x,y)$. So the x - coordinate changes to its opposite sign.

Answer:

B. It becomes the opposite sign