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)

What are the options

You have 2 sides that are 2 cms and you have 6 sides that are 1/2 cm and you have 4 sides that are 1 cm. the smallest sides are 1/2 the medium sized sides are 1 and the smallest are 1/2. so to find the perimeter you have to add them all up together so your answer will be 11 cm's