Answer:
7 units
Step-by-step explanation:
When you reflect a point (x, y) across the y-axis, the y-coordinate remains the same, but the x-coordinate gets the opposite sign: it becomes (-x, y).
Thus, if a point A, say, (-7, 5) is seven units to the left of the y-axis, its reflection A' will be the same distance to the right, at (7,5).
In the image below, Point A is seven units to the left of the y-axis. Its reflection, Point A', is seven units to the right of the axis.
