How do you get 16.9 when you solve the equation?

What are the constants in this expression? -10.6+9/10+2/5m-2.4n+3m

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.

Through non-collinear points there is exactly one plane.