Answer:
see attached
Explanation:
You want the given triangle reflected in the y-axis.
Reflection
The image of any given point on the triangle will be as far on the other side of the y-axis as the original is from the y-axis.
For example, point (1, 3), which is 1 unit right of the y-axis, will have its image at point (-1, 3), which is 1 unit left of the y-axis.
The attachment shows the reflected triangle.
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