Horizontal relationship is a relationship between equals, as opposed to a relationship between superiors and inferiors (vertical relationship). Source: http://www.eric.ed.gov/ERICWebPortal/custom/portlets/recordDetails/detailmini.jsp?_nfpb=true&_&ERICExtSearch_SearchValue_0=EJ126258&ERICExtSearch_SearchType_0=no&accno=EJ126258
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They are mutually perpendicular. However, they need not intersect: if they are in different planes, they will not intersect.
A horizontal line.A horizontal line.A horizontal line.A horizontal line.
A horizontal angle is an angle between lines on a horizontal plane.
this is horizontal: ---------------------------- / / this is at an angle: / / /
The independent variable is not linearly related by the independent variable over the domain. It does not mean that there is no relationship between the variables. For example, a quadratic relationship (y = ax2 + bx + c) over a domain that is symmetric about the vertex (-b/2a) will result in a horizontal line. Similar regions can be found for any polynomial of even order.