Vertical, horizontal, and all others, sometimes called skewed.
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3 lines and one plane
They both have slopes of 3/5 and so it appears that they are parallel lines
3 lines 3 planes
directindirectand..inverse??..(not sure..)
Graphically, it is the point of intersection where the lines (in a linear system) intersect. If you have 2 equations and two unknowns, then you have a 2 lines in a plane. The (x,y) coordinates of the point where the 2 lines intersect represent the values which satisfies both equations. If there are 3 equations and 3 unknowns, then you have lines in 3 dimensional space. If all 3 lines intersect at a point then there is a solution to the system. With more than 3 variables, it is difficult to visualize more dimensions, though.