Question

If point B has coordinates (-8, 1), what are the coordinates of the point when it is reflected across the y-axis?A. (8.1)O B. (-8, -1)oC. (-8, 1)O D. (8,-1)

Answer 1

We know that the reflection of the point (x,y) across the y-axis is the point (-x,y). In this case, we have:

`\begin{gathered} (x,y)=(-8,1) \\ \Rightarrow(-x,y)=(-(-8),1)=(8,1) \end{gathered}`

Therefore, the reflection across the y-axis of the point (-8,1) is the point (8,1).