MaeganR
  • MaeganR
Write an equation in point-slope form of the line through the given points. Then write the equation in slope-intercept form. #11. (4,0), (-2,1) #12. (-3,-2), (5,3) #13. (-5,1), (3,4) Thats all they give you. And YES I do know the Formulas: Point-slope: y-y1=m(x-x1) Slope-intercept: y=mx+b Slope: m=y2-y1/x2-x1
Mathematics
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SOLVED
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jamiebookeater
  • jamiebookeater
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chihiroasleaf
  • chihiroasleaf
first.., find the slope using the third formula that you write.., then use point-slope formula to find the equation..
anonymous
  • anonymous
m=y2-y1/x2-x1 (4, 0) (-2, 1) m=1-0/-2-4 m=1/-6 m=y2-y1/x2-x1 (-3, -2), (5, 3) m=3-(-2)/5-(-3) m=5/8 m=y2-y1/x2-x1 (-5, 1) (3, 4) m=4-1/3-(-5) m=3/8
MaeganR
  • MaeganR
SLOPE= -0.16

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MaeganR
  • MaeganR
@Butterfly16 Thats what I've done before, but then people come along, and tell me I'm wrong! ):
MaeganR
  • MaeganR
And why are you finding the slope 3 times?
chihiroasleaf
  • chihiroasleaf
because you have three questions and each question have equation... :)
MaeganR
  • MaeganR
oh, well I'm on #11.
anonymous
  • anonymous
y-y1=m(x-x1) (4,0), (-2,1) y-0=(1/-6)(x-4) y-0= -0.16x+0.7 y=-0.16x+0.7 Yeah, I just finding the slope for all of them. :o)
MaeganR
  • MaeganR
Im so freaking confused.
chihiroasleaf
  • chihiroasleaf
now.., using the similar way.., you can solve questions #12 and #13 can you? :)
anonymous
  • anonymous
y1 and x1 just stand for the points. So (4, 0) is the point, so y1 is 0 and x1 is 4. That would the equation for the point-slope form for that set of points.
MaeganR
  • MaeganR
but you have to write it in point-slope form?!
anonymous
  • anonymous
Then, I guess you can just plug in the numbers into the point-slope form so it'd just be: y-0=(1/-6)(x-4)
MaeganR
  • MaeganR
but don't you have to do 2 equations because of (4,0) and (-2,1)
chihiroasleaf
  • chihiroasleaf
@Butterfly16 has write it in slope-intercept form slope-intercept form is y = mx+ c , No.., points (4,0) and (-2,1) are on the same line.., so just choose one of them..
MaeganR
  • MaeganR
|dw:1358115682620:dw|
MaeganR
  • MaeganR
because like that?
anonymous
  • anonymous
Yip, the line would look like that. :o)
MaeganR
  • MaeganR
|dw:1358115910689:dw|
chihiroasleaf
  • chihiroasleaf
yup.., it's for the second line... :)
anonymous
  • anonymous
Awesome job! :o)
MaeganR
  • MaeganR
y-y1=m(x-x1) y--2=1/2(x--3) help
anonymous
  • anonymous
The points for number 12?
MaeganR
  • MaeganR
@erdog82 Kinda.
MaeganR
  • MaeganR
#12. i got that far but I'm stuck now.
anonymous
  • anonymous
y-y1=m(x-x1) (-3, -2) (5, 3) y-(-2)=(5/8)(x-(-3)) y+2=0.625x-1.875 y=0.625x-3.875
MaeganR
  • MaeganR
but y=mx+b
anonymous
  • anonymous
Yup, so for #12 it'd be y=0.625x-3.875
MaeganR
  • MaeganR
but thats y=mx-b it should be y=mx+b though right?
anonymous
  • anonymous
why are you guys using decimals? fractions are easier
anonymous
  • anonymous
no, it depends, if you are adding a negative, its the same as subtracting, and its okay @MaeganR
MaeganR
  • MaeganR
Can someone show mw how you get #13 now?
anonymous
  • anonymous
ok
anonymous
  • anonymous
4-1/ 3--5 (or 3+5) so what is that?
MaeganR
  • MaeganR
|dw:1358116987370:dw|
MaeganR
  • MaeganR
And @erdog82 what are you doing?
anonymous
  • anonymous
how do you get from y-1= 3/8 x--5 to y=mx +b form?
anonymous
  • anonymous
its as simple as adding 1 number
MaeganR
  • MaeganR
idk. I was trying to do it like @Butterfly16 was doing it.
anonymous
  • anonymous
oh and its y-1=3/8 x+5
anonymous
  • anonymous
so you add 1 to 5 and you get..
MaeganR
  • MaeganR
6
MaeganR
  • MaeganR
y=3/8x+6 ?
anonymous
  • anonymous
so its y=3/8 x +6
anonymous
  • anonymous
yes!
anonymous
  • anonymous
wasn't that easier than you thought?
MaeganR
  • MaeganR
A lil bit
anonymous
  • anonymous
Well, it seemed like the other people were kinda confusing..
MaeganR
  • MaeganR
just a little
anonymous
  • anonymous
well.. your done!

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