Reflect the point (3,-7) across the y-axis:
reflection across the y-axis
(x,y) ----> (-x,y)
(3,-7) ----> ........
To reflect a point across the y-axis, we change the sign of the x-coordinate while keeping the y-coordinate the same.
Given the point (3, -7), to reflect it across the y-axis, we change the sign of the x-coordinate, resulting in the point (-3, -7).
To reflect a point across the y-axis, you need to change the sign of its x-coordinate while keeping the sign of its y-coordinate unchanged.
Given the point (3, -7), to reflect it across the y-axis, you replace the x-coordinate with its negation and keep the y-coordinate unchanged.
So, for the point (3, -7), the reflected point across the y-axis would be (-3, -7).