What is an equation for the line that passes through points (–1, –4) and (1, 4)? Write the equation in slope-intercept form. (2 points)

- anonymous

- katieb

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- anonymous

y = mx + b m=(y2-y1)/(x2-x1)

- anonymous

@lolly wanna try

- anonymous

no..but i will..:)

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## More answers

- anonymous

(1,-4), m = -4 y = mx + b Sub to find b -4 = -4*1 + b b = 0 ------- y = -4x m = -4 means slope = -4. slope-intercept form of equation of a straight line is y = mx + b. m is the slope. b is the y-intercept. your equation starts of with the slope-intercept generic form of y = mx + b replace m with -4 to get y = -4x + b your line goes through the point (x,y) = (1,-4) that means the x-coordinate is 1 and the y coordinate is -4. to find the y-intercept, you replace y with -4 and x with 1 in the equation and solve for b. your equation of y = -4x + b becomes: -4 = (-4 * 1) + b

- anonymous

can you set up the equation? then ill solve:P

- anonymous

@swiftskier96 is that the answer http://www.algebra.com/algebra/homework/Graphs/Graphs.faq.question.233716.html hahaha

- anonymous

(x1,y1) = (–1, –4) (x2,y2) = (1, 4)

- anonymous

soo y=mx=b? isnt that for finding slope?

- anonymous

yes but you need to find m 1st \[y=\frac{ y2-y1 }{ x2-x1 }\]

- anonymous

meant m =

- anonymous

ook ill try it..hold on..:)

- anonymous

m=-6

- anonymous

now what?

- anonymous

show me how?

- anonymous

m is wrong :D

- anonymous

really?

- anonymous

m= 1-4/-1--4. m=-3/3 m=-6

- anonymous

(x1,y1) = (–1, –4) (x2,y2) = (1, 4) x1 = -1 y1 = -4 x2 = 1 y2 = 4

- anonymous

hi lolly :P

- anonymous

right..thats what i did..,.i think..?

- anonymous

hi..:)

- anonymous

(y-y1)/(y2-y1)=(x-x1)/(x2-x1)

- anonymous

@surdawi how did i do it rong?

- anonymous

(4- - 4)/(1- -1)= 8/2=4

- anonymous

so m is 4?

- anonymous

what you did (x2-y2)/(x1-y1)

- anonymous

well i thought it was -6..but its not..?

- anonymous

m = 4 now you choose wither point and solve for b y = 4x + b

- anonymous

k hold on ill try again..:)

- anonymous

\[m=\frac{ y2-y1 }{ x2-x1 }=\frac{ 4- -4 }{ 1- -1 }=\frac{ 8 }{ 2 }=\]

- anonymous

for slope slope=(y2-y1)/(x2-x1) it can be directly solve see the formula that i have given already

- anonymous

(y-y1)/(y2-y1)=(x-x1)/(x2-x1)

- anonymous

oooh!!! i got the x1and 2s switched up..ok i see..:)

- anonymous

|dw:1351797990809:dw|

- anonymous

the one with less numbers right?

- anonymous

there is no zeros for x or y this time so pick one and solve, it doesnt matter which one

- anonymous

which one would be easier?

- anonymous

either, same thing

- anonymous

k ill do the one with less numbers..:P

- anonymous

so 4=4x1=b? 4=b..but we already knew that..

- anonymous

both of them has same amount of numbers :p 4=4x1=b? ! why is there an equal to b

- anonymous

oooh! whoop..my bad..:)

- anonymous

so 4=4+4...

- anonymous

4=8? that dosent make sense...

- anonymous

4=4x1+ b what is x1 = ?

- anonymous

-1

- anonymous

y1 =?

- anonymous

-1

- anonymous

000h!!!

- anonymous

no it dosent..:)

- anonymous

-4

- anonymous

it should be one of the pairs either (1,4) or (-1,-4) -4 = 4*(-1) + b

- anonymous

-4=4x-1=4?

- anonymous

4*-1=?

- anonymous

-4

- anonymous

-4 = -4 + b how can you keep b on one side?

- anonymous

by adding 4 to b?

- anonymous

ok show me how?

- anonymous

-4=-4+b (then the 4 crosses out) +4 +4

- anonymous

-4 +4 = -4 + 4 +b 0 = b y = 4x + 0

- anonymous

where did the other set of -4=4 come from?

- anonymous

you have to add 4 to both sides

- anonymous

passes through points (–1, –4) and (1, 4)?

- anonymous

Anamaria what grade you in?

- anonymous

10.:)

- anonymous

you should know how to add :P

- anonymous

lol i do know how to add:)

- anonymous

-4=-4+b (then the 4 crosses out) +4 +4 was this rong?

- anonymous

lol @surdawi u sleeping?

- anonymous

i went to pray |dw:1351801108941:dw|

- anonymous

lol were u praying that id understand how to do this? lol jk ook umm anyway i thought b=4?

- anonymous

lol muslims pray 5 times a day not only sundays :P ok plug in b = 4 to check y = 4*x + 4 (1, 4) 4 = 4*1 + 4 4 = 8? is that right

- anonymous

4 is not 8...? im so confused!!

- anonymous

thats would be the answer if b was 4 correct answer is y = 4x + 0 = 4x plug in and check and where is my medal at??

- anonymous

do you want me to give you problem to do?

- anonymous

try solving this What is an equation for the line that passes through points (2,5) and (6,7)? Write the equation in slope-intercept form. (you pay $10 hehe)

- anonymous

noo i dont want another problem im too stuck with this one..:)

- anonymous

tell what you dont understand |dw:1351802673845:dw|

- anonymous

i dont really understand what you did..like at all... for the one on the right side...

- anonymous

ok (-1,-4) now we need to substitute that into y =mx + b y = -4 x = -1 m = 4 y = m* x + b -4 = 4*(-1) + b -4 = -4 + b we now need to add a 4 to both sides -4 = -4 + b +4 +4 -------------- 0 = 0 + b ===> b = 0

- anonymous

ok so b = 4 and 0?

- anonymous

no only 0 how do you get the 4?

- anonymous

what we did earlier..

- anonymous

we never got b = 4 we got m is 4

- anonymous

oooh!!!

- anonymous

i have to go to my Advance Engineering Math :( right now; which doesnt look like anything on here...try to figure it out; if you still have problems feel free to message me the answer is y = 4x

- anonymous

k thanks 4 ur help:)

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