The line y = 6 is horizontal and has a slope of zero, as does any line that is parallel to it.
The slope is 5. Parallel lines always have the same slope.
Slope = zero. The line is horizontal, parallel to the x-axis.
Slope = -1
It will have the same slope which is 2
The slope is -1 .
If: y = 7 then there is no slope and the line will be parallel to the x axis
For two lines to be parallel they must have the same slope. A line parallel to a line with slope -2 would have a slope of -2.
Any line with a slope of 1 is parallel to y=x-3.
It has no slope and it is a horizontal line parallel to the x axis on the Cartesian plane.