5. The Coordinate Plane
Sign In
To reflect a point in the x-axis, use the same x-coordinate and take the opposite of the y-coordinate.
To reflect a point in the y-axis, use the same y-coordinate and take the opposite of the x-coordinate.
( 14, 78)
(- 14,- 78)
We want to reflect a point in the x-axis of a coordinate plane. To do this, we keep the same x-coordinate and take the opposite of the y-coordinate.
| Point | Reflection in the x-axis |
|---|---|
| (x, y) | (x, - y) |
| (1/4, -7/8) | (1/4, 7/8) |
We want to reflect a point in the y-axis of a coordinate plane. To do this, we keep the same y-coordinate and take the opposite of the x-coordinate.
| Point | Reflection in the y-axis |
|---|---|
| ( x,y) | ( - x,y) |
| ( 1/4,-7/8) | ( - 1/4,-7/8) |