Question

Point P' is the image of P(3, 5), under a reflection across the y-axis. What are the coordinates of P'?

Answer 1

P'( -3 ,5).

Explanation:

Given : Point P' is the image of P(3, 5), under a reflection across the y-axis.

To find : What are the coordinates of P'

Solution : We have given

Pre image P( 3 ,5 ).

Rule of reflection over y axis : ( x ,y) →→→( -x , y) .

Here , x = 3 ; y = 5

Then , ( 3 ,5) →→→( -3 , 5) .

Therefore, P'( -3 ,5).

Answer 2

The point (0, 5) on the line of reflection is the midpoint between the original and its image.
.. P' = (-3, 5)