The coordinates of point a on a grid are (5, −3). point a is reflected across the x-axis to obtain point b. the coordinates of point b are (5, ).

The coordinates of point B are (5, 3).

Step-by-step explanation:

Given:

The coordinates of point A on a grid is (5, -3).

The point is reflected across the x-axis.

When a point on a grid is reflected across the x-axis, the coordinate rule for the reflected point B is given as:

Therefore, the 'y' value changes sign upon reflection across the x-axis.

Here,

Hence, the coordinates of point B are (5,-(-3)) = (5, 3)