David W. answered 11/29/16
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The Cartesian Coordinate System has an x-axis (horizontal) and a y-axis (vertical).
You may plot any point having the form (x,y) by locating the x-value (like on the number line) and then moving the distance of the y-value (while keeping the same x-value). Positive is to the right or up); negative is left (or down).
Plat the two points: A(-2.0, -3.4) and B(2.0, -3.4).
"Reflection" is how a mirror changes an image. So, when the points are plotted, fold the paper along the x-axis, unfold, then fold the paper along the y-axis. The fold that causes the two points to touch is your answer (choose either X or Y).