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parallel lines

Two lines that are in the same plane but do not intersect

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skew lines

Two lines that are not in the same plane and do not intersect

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slope

The ratio of vertical change (rise) to horizontal change (run) between any two points on a nonvertical line

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transversal

A line that intersects two or more coplanar lines at different points

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slope-intercept form

The general form of a linear equation: y=mx+b

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standard form

Ax + By=C where A and B are not both zero

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corresponding angles

Two angles that are in the SAME CORNER or CORRESPONDING positions. (Shown above with angles 4 and 5 and again with angles 3 and 6.)

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alternate interior angles

Two angles that lie BETWEEN the two lines and on OPPOSITE SIDES of the transversal. (Shown above with angles 4 and 5 and again with angles 3 and 6.)

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consecutive interior angles

Two angles that lie BETWEEN the two lines and on the SAME SIDE of the transversal. (Shown above as angles 4 and 6 and again with angles 3 and 5)

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alternate exterior angles

Two angles that lie OUTSIDE of the two lines and on OPPOSITE SIDES of the transversal. (Shown above as angles 2 and 7 and again with angles 1 and 8.)

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