from 1 the slopes of both lines are +ve.
from 2 the slopes of bother lines could be +ve or -ve.
I did it a different way and got a different answer. MA can you take a look and let me know. greatly appreciated. thanks.
I got C
C1. product of the two x-intercepts is positive
line k = b/m = +ve
line l = b/m = +ve
line k = b/m = -ve
line l = b/m = -ve
so m can be either +ve for both m or -ve or one and +ve for the other
C2. product of the y-intercept is -ve
line k -> b = +ve,
line l -> b = -ve
line k -> b = -ve
line l-> b = +ve
tells you nothing about the respective slopers
if line k's b/m = +ve and b = +ve then m = -ve
then line l ->b/m = +ve and b = -ve then m = +ve
product is negative
if line k's b/m = -ve and b = -ve then m = +ve
then line l -> b/m = +ve and b = +ve then m= -ve
product is -ve.