Question

Pentagon VWXYZ is shown on the coordinate grid. A student reflected pentagon VWXYZ across the x-axis to create pentagon V’W’X’Y’Z’.
Which rule describes this transformation?


A

(x,y)---(x,-y)


B

(x,y)---(x,y+8)


C

(x,y)---(-y,x)


D

(x,y)---(-x,y)

Answer 1

Reflecting across the x axis maintains the same x coordinate, but changes the sign of the y coordinate.

So, the transformation is

$(x,y)\mapsto (x,-y)$