Question

(-4,0) reflected across y=0 is it A)(-4,0) B)(4,0) C)(-4,-2) D)(0,0)

Answer 1

The answer would be B. (4,0)
Because you are pretty much reflecting the point from the 1st quadrant to the 2nd quadrant

Answer 2

A
The point (-4,0) lies on the x-axis. The line y=0 IS the x-axis. The point would be in the same place after a reflection.