Can someone please do 1-7 please i really need help with this im not so good in science :/

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.

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

Precalculus question, image attached.