When a polygon reflects across the y-axis, how do the coordinates of the points change?

The x coordinates become opposite of what they are originally are.

Step-by-step explanation:

If it is reflected over the y and one point is say (1,1) it would become (-1,1). The y does not change while the x would become opposite(Positive or Negative).

all the points will change sign in their x coordinate

Step-by-step explanation:

also when it reflects on the y axis means it went to the other part of the x axis and remained in the same part of the y axis (part means positive or negative depending)

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