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