Mathematics
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OpenStudy (anonymous):
Write an equation in slope-intercept form of the line that passes
through the points (-4,2) and (1,-1).
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OpenStudy (anonymous):
would it be \[y-2=\frac{ -3 }{ 5 }(x-4)\]
OpenStudy (anonymous):
|dw:1415604203866:dw| that is the answer i got
OpenStudy (anonymous):
@FibonacciChick666 @Nnesha @mathmath333 @ozzy22 @math92130
OpenStudy (anonymous):
is it correct
OpenStudy (anonymous):
@gorv
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OpenStudy (anonymous):
@JamesWolf
jimthompson5910 (jim_thompson5910):
you're very close
jimthompson5910 (jim_thompson5910):
but you made an error
jimthompson5910 (jim_thompson5910):
oh and I just caught the "slope intercept"
so you have to convert over to y = mx+b form
OpenStudy (gorv):
x coordinate is -4
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OpenStudy (gorv):
so we will right it as (x-(-4)) not the x-4
OpenStudy (gorv):
now we need to write in slope intercept form
OpenStudy (gorv):
u can conver your equation in that form
OpenStudy (anonymous):
ok
OpenStudy (gorv):
distribute -3/5 first insidethebracket
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OpenStudy (anonymous):
ok um ill be right back
OpenStudy (gorv):
can u do that
OpenStudy (anonymous):
ok im back sorry about that
OpenStudy (gorv):
lol..u got what i told ??
OpenStudy (anonymous):
no i dont get do i have to put the fraction into brackets like these { or these ]
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OpenStudy (gorv):
2(x+2)=2*x+2*2=2x+4 this how we distribute
just multiply the number outside the bracket with element inside the bracket
OpenStudy (anonymous):
so the anwser is 6
OpenStudy (anonymous):
@jim_thompson5910
jimthompson5910 (jim_thompson5910):
how are you getting 6?
OpenStudy (anonymous):
well um isnt it 2*1+4=6
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OpenStudy (anonymous):
1=x
jimthompson5910 (jim_thompson5910):
why are you plugging in x = 1? and the expression 2(x+2) was just an example on how to distribute
OpenStudy (anonymous):
oh lol sorry
OpenStudy (anonymous):
so what would the anwser be @gorv
OpenStudy (gorv):
\[y-2=\frac{ -3 }{ 5 }(x+4)\]
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OpenStudy (gorv):
\[y-2=\frac{ -3 }{ 5 }*x+4*\frac{ (-3) }{ 5 }\]
OpenStudy (gorv):
now add 2 on both side
OpenStudy (anonymous):
oh i made it - while it was supposed to be +
OpenStudy (gorv):
just add 2 on both side ...
OpenStudy (anonymous):
so y=3/s*x+4*1.4
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OpenStudy (anonymous):
am i right or wrong
OpenStudy (anonymous):
@jim_thompson5910
jimthompson5910 (jim_thompson5910):
-3/5 = -0.6
you can't say 4*(-0.6) + 2 = 4*1.4
that's incorrect
jimthompson5910 (jim_thompson5910):
sure -0.6 + 2 = 1.4 is true, but that 4 up front changes things
OpenStudy (anonymous):
so the anwesr would be
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OpenStudy (anonymous):
?
jimthompson5910 (jim_thompson5910):
You can't expect us to just give you the answer. Try it again.
OpenStudy (anonymous):
ok
jimthompson5910 (jim_thompson5910):
hopefully you see how gorv got
\[\Large y-2=\frac{ -3 }{ 5 }*x+4*\frac{ (-3) }{ 5 }\]
right? or no?
OpenStudy (anonymous):
yea but i did it and thats how i got
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jimthompson5910 (jim_thompson5910):
the next thing to do is to add 2 to both sides
OpenStudy (anonymous):
Refer to the attachment.
OpenStudy (anonymous):
y=-3/5*x+4 and how do i subtract -3/5 from 2 @jim_thompson5910
jimthompson5910 (jim_thompson5910):
first off, what is 4 times -3/5 equal to
OpenStudy (anonymous):
-2.4
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jimthompson5910 (jim_thompson5910):
ok we can keep it as a decimal for now
jimthompson5910 (jim_thompson5910):
add 2 to that to get what number?
OpenStudy (anonymous):
0.4
OpenStudy (anonymous):
@omg1help
y=-3/5*x+4
The 4 should be -(2/5)
jimthompson5910 (jim_thompson5910):
-2.4 + 2 is not 0.4
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OpenStudy (anonymous):
sorry meant -0.4
jimthompson5910 (jim_thompson5910):
so we have (-3/5)x + (-0.4) or (-3/5)x - 0.4
jimthompson5910 (jim_thompson5910):
convert 0.4 to a fraction to get what?
OpenStudy (anonymous):
4/10
jimthompson5910 (jim_thompson5910):
reduce that
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OpenStudy (anonymous):
2/5
jimthompson5910 (jim_thompson5910):
so the answer is \[\Large y = -\frac{3}{5}x - \frac{2}{5}\]
OpenStudy (anonymous):
really that was so easy i cant believe i didnt get it
jimthompson5910 (jim_thompson5910):
because that is equivalent to \[\Large y-2=-\frac{ 3 }{ 5 }*(x+4)\]