Mathematics for IGCSE & O level - Transformations (Section 5 - No. 7)
If a shape is reflected across the y-axis, how do the coordinates of a point on the shape change?
The x-coordinate changes sign, the y-coordinate stays the same.
The y-coordinate changes sign, the x-coordinate stays the same.
Both x and y coordinates change signs.
Neither x nor y coordinates change.
Explication
When reflecting across the y-axis, only the x-coordinate changes sign.