If the slopes of two lines are unequal, they will cross somewhere, so the distance between them depends on x, and isn't really defined.If the slopes are equal, they are parallel, so they don't cross. So two lines are far apart if they have the same slope and a large difference in their x or y intercepts.
Relief
lines that are beside each other and never meet
Perpendicular and parallel lines are two examples.
That's the only kind of parallel lines there are, non-intersecting!
If the "contour interval" ... the elevation difference between lines ... is the same everywhere on the map, then the lines will be closer rogether on steep ground, and farther apart on flatter ground.
Parallel lines-lines in the same plane with the same slope.
If the slopes of two lines are unequal, they will cross somewhere, so the distance between them depends on x, and isn't really defined.If the slopes are equal, they are parallel, so they don't cross. So two lines are far apart if they have the same slope and a large difference in their x or y intercepts.
Relief
Contour lines that are far apart indicate a gentle slope. Because contour lines connect points with the same elevation, wide spacing indicates that the elevation is not changing drastically.
A topographic map shows the elevation of the Earth's surface using contour lines to represent changes in elevation. The closer together the contour lines, the steeper the terrain; the farther apart, the gentler.
Lines that are very close indicate a steep change in altitude. Far apart means a slow or gradual change.
The farther apart elements are on the periodic table, the more likely they are to form ionic bonds. Ionic bonds occur between elements with significantly different electronegativities, causing one element to transfer electrons to the other, resulting in the formation of positively and negatively charged ions that are then attracted to each other.
inactive
intersecting lines divergent lines convergent lines
Parallel lines
Straight lines.