Question

Will Medal And Fan !

Question 8.8. Select the pair of equations whose graphs are perpendicular.(Points : 5)
A. 2x – 8y = 9 12x – 3y = 7

B. 3x + 6y = 8 y = 2x – 8

C. y = 2x – 7 x + y = 3

D. 2y = –3x + 5 2x + 3y = 4

Answer 1

The answer is D.

Answer 2

D

Answer 3

thanks guys <3

Answer 4

Could you fan me.

Answer 5

already did dude (:

Answer 6

Oh. Thx! :D

Answer 7

anytime !

Answer 8

the answer is not D

Answer 9

2 lines are perpendicular when their slopes are negative reciprocals of each other

Answer 10

B. 3x + 6y = 8 y = 2x – 8
if u arrange 3x+6y=8 in terms of y
y=-3x/6 +8/6
=-1/2 x +4/3, y=2x-8

and -1/2 is the NEGATIVE RECIPROCAL OF 2/1 so

Answer 11

oh. what is it? i got d on a line graph.

Answer 12

y=(-1/2) x +4/3, y=(2/1)x-8
^--------------^------------- slopes

Answer 13

wait what? I'm confused :/

Answer 14

@dan815

Answer 15

okay i can explain

Answer 16

but do u have time for that, arent u writing an exam

Answer 17

I have 21 minutes left and only one question so i have time

Answer 18

okay well

Answer 19

you know about line form?
y=mx+b
m is the slope
b is the y intercept

Answer 20

Yes I understand that

Answer 21

okay so lets see what this m really means

Answer 22

lets look at y=mx line
this m is slope means change in y / change in x
in other words you go up by m units for every 1 unit of x

Answer 23

I just don't get how D isn't the answer

Answer 24

because when you rearrange it in y=mx+b form the slopes are not negative recriprocals of each other

Answer 25

D. 2y = –3x + 5, 2x + 3y = 4
y=-3/2x+5/2, y=-2x/3 +4/3
^---------------------^---------
it has to be
-3/2 and 2/3
or 3/2 and -2/3

Answer 26

but in this case both of the slope are negative

Answer 27

ud expect a line perpendicular to be something like htis

Answer 28

So the answer would be B then, right?

Answer 29

yeah.. but -.-

Answer 30

do u really understand

Answer 31

I do. You've helped a lot, thank you! <3