Question

If ABC is reflected across the y-axis, what are the coordinates of A?8ÁA-8-628224-6O A. (1,2)O B. (4,-2)O C. (-4,-2)(O D. (4,2)

Answer 1

A reflection over the y-axis can be done in a given point by simply changing the sign of the x-coordinate of the point. This will get the point to the exact place that is equal distance from the y-axis.

So, for A, it was at coordinate:

`A=(-4,2)`

So, we change the sign of the x-coordinate to get A':

`\begin{gathered} A^(\prime)=(-(-4),2) \\ A^(\prime)=(4,2) \end{gathered}`

Which is alternative D.