Respuesta :

Thee line x = 0 is the y axis.  Reflecting (-4, 0) across the y axis just means you are moving the point to the opposite side of the y axis the same number of units it's away from it right now.  Right now it's 4 units to the left, so we will move it 4 units to the right of it to give us a new location of (4, 0)
Line x = 0 is the y-axis.  If you reflect point A across it, which is at (-4, 0), you should get (4, 0).