It means to chanhe the y value (4,5)to (-4,5)
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reflection in the x-axis
For a given coordinate pair. A reflection in the y-axis is making the 'x' term negative. e.g. ( a,b,) ' (-a, b). Similarly for a reflection in the x-axis is making the 'y' term negative. e/.g. ( c,d) ; ( c,-d).
If the coordinates of a point, before reflection, were (p, q) then after reflection, they will be (-p, q).
c
Reflection about the y-axis.