Well they have to be perpendicual because they cross and parallel means that they are like lines on lines paper, they do not cross, they just keep going. Hope this helps :)
First you have to put the 4 committees separate then put one by one in each group then you will see you answer in the groups
Answer:
m=0
Step-by-step explanation:
m=y2-y1/x2-x1
m=1/2-1/2/-2-7
m=0/-9
m=0
It's 4:3 because it's divided by 6