Question

which pair coordinates represent a line with a negative slope?
a.(1,2)and (2,0)
b.(2,3)and (4,10)
c.(5,9)and(5,8)

Answer 1

option a.

Answer 2

slope of a line passing through two point x1,y1 and x2,y2 is given by
slope=(y2-y1)/(x2-x1)
let's check each option
a) 1,2 and 2,0
(2-0)/(1-2)=-1
b) 2,3 and 4,10
(3-10)/(2-4)=3.5
c) 5,9 and 5,8
(9-8)/(5-5)= infinity
so option A