vertical and horizontal lines
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a line parallel to y=-6 is what kind of line
horizontal line
a line perpendicular to x=-3 is what kind of line
horizontal line
what kind of line has zero slope
horizontal line
what kind of line is y=-8
horizontal line
a line parallel to x=-3 is what kind of line
vertical line
a line perpendicular to y=-6 is what kind of line
vertical line
what kind of line has an undefined slope
vertical line
what kind of line is x=5
vertical line
vertical
x=a
horizontal
y=b
