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Answer:
see attached
Explanation:
You are being asked to draw the reflection of the triangle DKW.
As with a reflection in a mirror, the reflected object appears to be as far behind the mirror as the original object is in front of the mirror.
When you reflect a point across a line, the image is as far from the line on the other side as the original point is from the line. When the line of reflection is a vertical line, as here (x = 0 = y-axis), the y-coordinates are unchanged.
Points W and K are 2 units to the right of the y-axis. Their reflections will lie on the same horizontal line, but will be 2 units to the left of the y-axis.
Point D is 5 units to the right of the y-axis, so its reflection will be 5 units to the left.
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Additional comment
The original triangle and its reflection are symmetrical about the line of reflection.