Answer:
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
