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3 has 1 line of horizontal symmetry
3 (w/ horizontal line of symmetry) and 8 (horizontal and vertical).
LV with 3 horizontal lines over it followed by MMM with 2 horizontal lines over it
A vertical line has the same x-value. A horizontal line has the same y-value. The equation, y=3 would graph as a horizontal line crossing the y-axis at 3.