4. Ian and his friends are renting a cabin charges an initial fee plus a rate per night. The
relationship between the cost and the number of
nights is shown in the graph.

in geometry, parallel lines are lines in a plane which do not meet; that is, two lines in a plane that do not intersect or touch each other at any point are said to be parallel. by extension, a line and a plane, or two planes, in three-dimensional euclidean space that do not share a point are said to be parallel.