Express this in standard form 5.4×10^1

A, b, c, and d have the coordinates (-8, 1), (-2, 4), (-3, -1), and (-6, 5), respectively. which sentence about the points is true? a. a, b, c, and d lie on the same line. b. and are perpendicular lines. c. and are parallel lines. d. and are intersecting lines but are not perpendicular. e. and are parallel lines.

How do you use the elimination method for this question? explain, because i really want to understand!

Aquadrilateral has exactly one pair of parallel sides. which name best describes the figure?