Reflection in axis Reflection in the x axis The rule for a reflection over the x-axis is (x,y)⟶(x,−y). In the reflection in the x,y is negative Reflection in the y axis The rule for a reflection over the y-axis is (x,y)⟶(−x,y). Reflection in the line y=x : The rule for a reflection in the line y=x is (x,x)⟶(y,x) Reflection in the line y=−x : The rule for a reflection in the origin is (x,y)⟶(−y,−x). Reflection of the point (x,y)=(−x,y) Reflection of (4,3) in the y-axis ⟶S′=(−4,3)