Kevin reflects square ABCD on a coordinate plane over the y-axis to create image A'B'C'D'. Which property changed when he created image A'B'C'D'?

Question

A: the position of figure ABCD

B: the measure of

C: the perimeter of square ABCD

D: the area of square ABCD

Answer 1

The y values will be the same for all four points, but the x values will be the additive inverse of the original x values.

For instance, if the original square ABCD is in quadrant I where x is positive and y is positive, then reflected across the y axis it will be in quadrant II where x is negative and y is still positive.

Also, the point with a positive x value closest to the y axis will remain the closest x value to the y axis but this time it will be a negative x value.