Question

2,-1 reflected over y axis

Answer 1

(-2,-1)

Explanation:

It is just flipped on the y axis.

(2,-1) is in the 4th quadrant.

When you plot the same point reflected over the y axis both numbers will become negative.

(-2,-1) and this point will be in the 3rd quadrant.

Try drawing out the quadrant plane and labeling.