Question

What are the coordinates of the Image of point M under a Reflection across the y-axis?

A. (-1,2)
B. (-2, 1)
C. (-2,-1)
D. (1, -2)​

Answer 1

(C)

Explanation:

Reflection Rule for the Y-Axis:

`(x,y) \rightarrow(-x,y)`

Using the mapping rule and Point M:

`(2,-1) \rightarrow (-2,-1)`

`\text {M' is: } (-2,-1)`

The correct option should be C.