Question

what is the image of (-6,6) after a reflection across the y-axis

Answer 1

To reflect it across the y-axis means to go from quadrant 2 to 1.

In quadrant 1, both x and y are positive.

So, (-6,6) becomes (6,6).

Answer 2

the graph would look like this (see below):

the coordinates would be (6,6)