Question

Point P (2,1) is reflected across the y-axis. What is the coordinate of the reflected point, P'? A). (2,-1)B). (-2,1)C). (-1,2)D). (-1,-2)

Answer 1

For this case we have the following point:

P(2,1)

And we want to find the reflection across the y-axis so we can use the following formula:

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

Replacing we got:

B) (-2,1)