3. the lines shown in the figure below are what...

a. parallel
b. perpendicular
c. neither
d. both

4. two lines are perpendicular when..
a. the product of the slopes is -1.
b. the product of thier slopes is greater than 0
c. they have the same slope
d. thier slopes are undefined

Question

3. the lines shown in the figure below are what...

a. parallel
b. perpendicular
c. neither
d. both

4. two lines are perpendicular when.. 
a. the product of the slopes is -1. 
b. the product of thier slopes is greater than 0
c. they have the same slope
d. thier slopes are undefined

anonymous · Answer

attachment

aripotta · Answer

for the first one, all you have to do is find the slopes of the lines. they LOOK parallel, but you never know for sure.

aripotta · Answer

do they have the same slopes?

anonymous · Answer

im guessing yes

aripotta · Answer

you can't guess :L you have to be sure by finding their slopes

anonymous · Answer

okay im doing it now :p

anonymous · Answer

whats -2 - -8?

anonymous · Answer

i dont have a calculator near lol

anonymous · Answer

+6

aripotta · Answer

you shouldn't be doing -2 - (-8) :l

anonymous · Answer

omg lol you kidding. how the heck do i find the slope then? i thought it was y2-y1 and x2-x1

aripotta · Answer

it is, but -8 and -2 are on two different lines..

aripotta · Answer

they give you 2 coordinates from each line (-2,7) (1,-2) for the first one, and (-8,5) (-5,-4) for the other

anonymous · Answer

oh okay.. i see what you mean now. brb ill figure them out

aripotta · Answer

the slope is (y2 - y1)/(x2 - x1)

anonymous · Answer

okay, i dont have a scientific calc in my house right now, but for the first one, i got -4-5... and -5 - (-8).. and for the second one, -2 - 7 and 1- (-2)

anonymous · Answer

i seriously cant solve them without a calc though lol

aripotta · Answer

if you break it down, it'll help. it's simple math once you do that. -4 - 5 = ?

anonymous · Answer

1?

aripotta · Answer

no, it would be 1 if it was -4 + 5. but it's -4 - 5, so it would be -9

aripotta · Answer

-5 - (-8) = ?

anonymous · Answer

3

aripotta · Answer

yes :D so the slope for the first line is -9/3 or simplified, -3

anonymous · Answer

okay, and for the other one, -9/3

anonymous · Answer

oh theyre the same lol

anonymous · Answer

which means theyre parallel?

aripotta · Answer

yep

anonymous · Answer

okay no how do i know if they are perpendicular?

aripotta · Answer

i don't even why d is a choice. you can't have two lines that are parallel AND perpendicular...

anonymous · Answer

lol for people like me lmfao, who dont know the difference haha so its only parallel then correct?

aripotta · Answer

i guess a lol

anonymous · Answer

okay now for the second one..

aripotta · Answer

yea, the first one is parallel . and the second one is a

anonymous · Answer

awesome thank you so much(:

aripotta · Answer

3/5 * -5/3 = -15/15 = -1

aripotta · Answer

yep, a

aripotta · Answer

no problem :)