All y-values in the function are multiplied by -1. This function is 'flipped' over the x-axis.
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the z axis is at right angles to both the x and the y axis. All 3 axis pass through the origin.
x=2 means that on a graph, on the x axis, there is a point. Also, since it is just x=2 it means that the slope is undefined, or that there is a line that is going through that point that is perpendicular to the x-axis. So basically there is a line that goes through (2,0) that is parallel to the y-axis.
Example: if you have a point with the coordinates (2,4), a reflection over the y-axis will result in the point with coordinates (-2,4).
Vertical. Vertical. Vertical. Vertical.
When you with respect to the x-axis then this is like saying with reference to the x-axis. You are using the x-axis as a guide.