For this, you are basically flipping the shape. So the bottom-most point on the triangle will be the same on the x-axis, but will be -1 on the y-axis in its image (new form).
The top left point will stay the same in the x-axis, and will be -4 on the y-axis
Finally, the top right point will stay true same on the x-axis, but will be -4 on the y-axis in its image.
If you could mark my answer the brainliest it would be very much appreciated!