HELP 30 POINTS Given the system below, SELECT all terms that will be
eliminated by adding the equations together.
-x + y = -1
2x-y=0

-x

2x

y

-y

-1

0

What kinds of numbers have an odd number of factors?

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.

Which one ? is the answer and how to find this answer