Which two pairs of coordinates represent a line with a negative slope?

(1, 2) and (2,0)

(2, 3) and (4, 10)

(5, 9) and (5, 8)

Question

Which two pairs of coordinates represent a line with a negative slope?
 	
	
(1, 2) and (2,0)
	
(2, 3) and (4, 10)
	
(5, 9) and (5, 8)

anonymous · Answer

we know the slope a=y1-y2/x2-x1

anonymous · Answer

yes

anonymous · Answer

so try the first one replace in the equ i told you about and sorry in the denominator it x1-x2 sorry

anonymous · Answer

youll get 2-0/1-2 which is -2 which is a negative slope so its A :)

anonymous · Answer

oohhh i get it. so i have to calculate all the slopes and then pick which one is the negative one out of them?

anonymous · Answer

@joyraheb

anonymous · Answer

of course and obviously mentally you could directly know if the value is negative or positive