To find the new coordinates of vertex A after a dilation centered at the origin with a magnitude of 3, you can multiply the coordinates of point A by the scale factor.
The coordinates of point A are (-1, 3).
To perform the dilation:
- For the x-coordinate: \(-1 \times 3 = -3\)
- For the y-coordinate: \(3 \times 3 = 9\)
So, the coordinates of the new vertex A' after the dilation would be:
\[ A'(-3, 9) \]