Question

Which of these points are on a line that has a slope of -3?

(9, 2), (4, 3)



(9, 2), (3, 4)


(2, 9), (3, 4)


(2, 9), (4, 3)

Answer 1

Simple....

using the formula
`( y_(1)- y_(2) )/( x_(1)- x_(2) )` to find slope....

1.) (9,2)(4,3)


`(2-3)/(9-4)= -(1)/(5)` (No)

2.) (9,2)(3,4)


`(2-4)/(9-3) = -(2)/(6) =- (1)/(3)` (No)

3.) (2,9)(3,4)


`(9-4)/(2-3) = (5)/(-1) =-5` (No)

4.) (2,9)(4,3)


`(9-3)/(2-4) = (6)/(-2) =-3` (YES!)

Thus, your answer.