Reflect the triangle (2,-3) (6,-6) (6,-8) over the y-axis. what are the new vertices?

Think of a point in Quadrant 1.
For example, think of point (1, 1).
If you reflect it over the y-axis, the reflection will be the same distance from the y-axis, in Quadrant 2. The coordinates of the reflection are (-1, 1).
What changed from (1, 1) to (-1, 1)?
The only change is the x-coordinate became its reciprocal.
That means in this problem, each point changes by replacing the x-coordinate by its reciprocal.

(2, -3) becomes (-2, -3)
(6, -6) becomes (-6, -6)
(6, -8) becomes (-6, -8)

The new vertices are: (-2, -3), (-6, -6), (-6, -8)

The answer is 10. and if you go by pemdas you would 1. multiplication 2. division 3. addition 4. subtraction