The original triangle shown in the diagram above is reflected across the
y-axis. In which quadrant is the image
of the triangle located?

Quadrant #2 The one of the upper left corner

Step-by-step explanation:

If you reflect across the y-axis the x coordinate's become negative but the y-coordinates stay positive

so if you reflect it over the y-axis the coordinate's would be

(-4, 1), (-2, 2), (-3, 4)

yes the total will be same because in both of them the expression.is rearranged but their sign remains the same hence it hss just been shuffled