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

- MaeganR

- jamiebookeater

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- chihiroasleaf

first.., find the slope using the third formula that you write.., then use point-slope formula to find the equation..

- 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

SLOPE= -0.16

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## More answers

- MaeganR

@Butterfly16 Thats what I've done before, but then people come along, and tell me I'm wrong! ):

- MaeganR

And why are you finding the slope 3 times?

- chihiroasleaf

because you have three questions and each question have equation... :)

- MaeganR

oh, well I'm on #11.

- 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

Im so freaking confused.

- chihiroasleaf

now.., using the similar way.., you can solve questions #12 and #13
can you? :)

- 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

but you have to write it in point-slope form?!

- 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

but don't you have to do 2 equations because of (4,0) and (-2,1)

- 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

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- MaeganR

because like that?

- anonymous

Yip, the line would look like that. :o)

- MaeganR

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- chihiroasleaf

yup.., it's for the second line... :)

- anonymous

Awesome job! :o)

- MaeganR

y-y1=m(x-x1)
y--2=1/2(x--3)
help

- anonymous

The points for number 12?

- MaeganR

@erdog82
Kinda.

- MaeganR

#12. i got that far but I'm stuck now.

- 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

but y=mx+b

- anonymous

Yup, so for #12 it'd be y=0.625x-3.875

- MaeganR

but thats y=mx-b it should be y=mx+b though right?

- anonymous

why are you guys using decimals? fractions are easier

- anonymous

no, it depends, if you are adding a negative, its the same as subtracting, and its okay @MaeganR

- MaeganR

Can someone show mw how you get #13 now?

- anonymous

ok

- anonymous

4-1/ 3--5 (or 3+5) so what is that?

- MaeganR

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- MaeganR

And @erdog82 what are you doing?

- anonymous

how do you get from y-1= 3/8 x--5 to y=mx +b form?

- anonymous

its as simple as adding 1 number

- MaeganR

idk. I was trying to do it like @Butterfly16 was doing it.

- anonymous

oh and its y-1=3/8 x+5

- anonymous

so you add 1 to 5 and you get..

- MaeganR

6

- MaeganR

y=3/8x+6 ?

- anonymous

so its y=3/8 x +6

- anonymous

yes!

- anonymous

wasn't that easier than you thought?

- MaeganR

A lil bit

- anonymous

Well, it seemed like the other people were kinda confusing..

- MaeganR

just a little

- anonymous

well.. your done!

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