L1 : (-1, 4) and (3, 2) l2: (2, 5) and (4, 9) a. perpendicular b. neither c. parallel

Perpendicular

Step-by-step explanation:

L1 :

let  A(-1,4)    B(3,2)

the slope is :   (YB - YA)/(XB -XA)

(2-4)/(3+1)  = -2/(4)  

the slope is : -1/2

L2 :

let  C(2,5)    D(4,9)

the slope is :   (YD - YC)/(XD -XC)

(9-5)/(4-2)  = 4/(2)  

the slope is : 2

2×(-1/2)= -1

Perpendicular

-5, your answer was correct