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if |x-5| >0 , then x-5=3
if |x-5| <0, then -x-(-5)=3;
-x+5=3

d?

not d

ohh a?

haha right. It's a

i suppose its not ?

it is!
plot the graph and you will see. Every point (x,y) is in an unique line

oooh haha thanks

|dw:1358481474606:dw|

and you can even write the function, which is y=5-4x

that one is yes; 5 ?

right

d?

in this case, any member of the sequence is given by An= -12 + 5n

hahaha, calm down!

haha mybad

well, that's the same as the other

actually, it is yes

(by the way, the previous one is d, sorry)

i know, thank you

you need to find the slope
which is deltay/deltax

y=ax+b
a is the slope
once you find it, just put any value for y from the tableand you get b

it is (-2/5)x , right?

yep

just multiply everything by 5

c?

no a ! haha

yes

thanks your helping so much

you're welcome :)

aaaaaa, I forgot the rule

to be perpendicular, the multiplication of the slopes' values must be -1, is it right?

the equation you need to find is y=ax+b
a.(-1/3) = ?
then substitute (4;3)

ah, the slope2 of a perpendicular line is -1/slope1

a1 the slope of a line
a2 the slope of a perpendicular line
then a2= -1/a1
or a1.a2=-1

hmm C?

yes

subtracting the first by the second, you have 0=5x-25
this gives you x=5

substitue x in any of the equations and you find y

im confused

idk where 0=5x-25 is from :/

y=x-14
y=-4x+11 (minus)
_____________
0=x-(-4x)-14-11

or
since y=y, then x-14=-4x+11

d?

no, it's a, the simplest

ohh lol

haha

a way to solve it is writing the equations of stickers collected by each of them

being m = months, then
Bradley: Stickers=23+4m
Ryan: Stickers=9+6m

b.2 months?

it is the same as the previous, and you can just write
y=23+4x
y=9+6x
you want to know x

not b

hmm

in this case, you don't want to know y

either, you could substitute the options in the formulas and see if they give the same number

i dont know :(

Sure you know!
Bradley: [number of stickers]=23+4x
Ryan: [number of stickers]=9+6x

if you call number of stickers as 'y'
then you see that y MUST be the same in both equations

and so the right hand sides of the equations

so 23+4x=9+6x
and you just need to find x

7months!

yes! haha

haha thank you thank you

oh well, there's any other problem?
I must go soon :P

let's see

You are right

but look at the system and you will see one is the same as the other

one equation is the same as the other

so you can't find just one value for (x,y)
any x value gives an right y value

multiply the second by 12, and you will end up with 2 equal equations

oohh so its B?

no, it is infinite, as you said

i see

you have 1 equation and 2 variables

any given value of x will result in a y
or any y will result in a x

all of then right

What is the slope of the line that passes through the pair of points?
(5, 7), (2, 1)
8/7
2
–8/7
1/2

deltay/deltax

i still have to graph some questions but i will let you know

if you are not in a hurry, i can answer as soon as i come back

k im not in a hurry

(7-1)/(2-5) or (1-7)/(5-2)
You just need to use the correspondent positions to x's and y's values

like (y2-y1)/(x2-x1) or (y1-y2)/(x1-x2)
but not (y2-y1)/(x1-x2) or (y1-y2)/(x2-x1)

any other question, message me :)
bye!

thank u