Answer:
2nd quadrant.
Step-by-step explanation:
The given point is P(2,3). This is in 1st quadrant.
Now, this point is reflected across the y-axis.
When we reflect this point p about the y-axis then the y -coordinate remains same but the x- coordinate will be the negative of previous one.
Therefore, the coordinate of the point after reflection is P'(-2,3)
Here x coordinate is negative and y coordinate is positive.
Hence, the point P'(-2,3) is in 2nd quadrant.