 anonymous
Determine whether y varies directly with x. If so find the constant variation.
y = 12x ****** The answer is Yes; 12
I dont understand how this is the answer. Can someone help me?
 jamiebookeater
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 anonymous
my guess would be that its because y is equal to whatever 12(x) is going to be.
 anonymous
but that seems too easy
 anonymous
i know. How about y = 4x+1
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 anonymous
the asnwer is no
 anonymous
i am probably in over my head.. sorry
 lgbasallote
here's something you can remember...
if y and x are in one line...then it's a direct variation
if either y or x is in the denominator...then inverse variation
 lgbasallote
\[y = kx \leftarrow \; \text{direct variation}\]
\[y = \frac kx \leftarrow \; \text{inverse variation}\]
 anonymous
ok so how does that apply to my first problem
 lgbasallote
y = 12x <in the for y = kx <can you see that?
 lgbasallote
in the form*
 anonymous
oh ok so how does it arie directly with x.. Im sorry im just not seeing the picture
 anonymous
varie* My teacher isnt that good
 lgbasallote
look at what i said above about y = kx
 anonymous
yeah I know but what does K mean how the flutter does it varie with anything?
 lgbasallote
k is a constant
 lgbasallote
it is called the proportionality constant
 lgbasallote
it means its value doesnt matter because it is constant..in other words...always stays the same
 anonymous
ok now I get why 12 is there.. So now explain the rest please?
 lgbasallote
in your terms... k is the constant variation
 lgbasallote
first tell me... do you agree that y = 12x is in the form y = kx?
 anonymous
is y = k? which is 12? and how does that varie to x?
 anonymous
Yeah I get that
 lgbasallote
what do you see as difference between \[\huge y = kx\]
and \[\huge y = 12x\]
 anonymous
yeah I see that
 lgbasallote
spot the difference
 lgbasallote
not the similarity
 anonymous
yeah
 lgbasallote
what do you mean yeah?
 anonymous
I spot the difference
 lgbasallote
what's the difference??
 anonymous
12 instead of K
 lgbasallote
RIGHT! that's why 12 is the constant variation
 lgbasallote
because k is the constant variation..and k = 12
 anonymous
ohhh K= Constant Variationnnnnn
 lgbasallote
yes!
 anonymous
lmfao face to palm**
 anonymous
ok so what about this one y = 4x + 1
 lgbasallote
the answer to that one was "NOT direct variation" right?
 anonymous
yes
 lgbasallote
that's because of the 1
y = 4x + 1 is not in the form y = kx because of that 1
 anonymous
what about y  6x = 0
 anonymous
;)
 lgbasallote
simplify it first
 lgbasallote
solve for y first
 anonymous
can you do it?
 anonymous
I dont wnana get confused
 lgbasallote
add 6x to both sides
 anonymous
add 6 to 0?
 lgbasallote
6x..not 6
 anonymous
yeah
 anonymous
y=6x?
 anonymous
im a idiot
 lgbasallote
y?
 anonymous
lmfao it was negative
 anonymous
OH NVM
 anonymous
alright so the answer is 6!
 lgbasallote
yes
 anonymous
what about y _ 3 = 3x
 anonymous

 lgbasallote
what do you think?
 anonymous
add 3 to both sides
 anonymous
y= x?
 lgbasallote
you can't combine 3 and 3x
 anonymous
is that a constant variation?
 lgbasallote
no..im just talking about algebra
 anonymous
Ah forget about that one can you help me with proportions? i'll open up a new question
 lgbasallote
i have to go soon
 anonymous
awe ur like the best lol
 lgbasallote
call saifoo or amistre
 anonymous
eh Saifoo is a fool now he used to be cool
 anonymous
amistre doesnt help me anymore
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