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)

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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)

Mathematics
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y = mx + b m=(y2-y1)/(x2-x1)
@lolly wanna try
no..but i will..:)

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(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
can you set up the equation? then ill solve:P
@swiftskier96 is that the answer http://www.algebra.com/algebra/homework/Graphs/Graphs.faq.question.233716.html hahaha
(x1,y1) = (–1, –4) (x2,y2) = (1, 4)
soo y=mx=b? isnt that for finding slope?
yes but you need to find m 1st \[y=\frac{ y2-y1 }{ x2-x1 }\]
meant m =
ook ill try it..hold on..:)
m=-6
now what?
show me how?
m is wrong :D
really?
m= 1-4/-1--4. m=-3/3 m=-6
(x1,y1) = (–1, –4) (x2,y2) = (1, 4) x1 = -1 y1 = -4 x2 = 1 y2 = 4
hi lolly :P
right..thats what i did..,.i think..?
hi..:)
(y-y1)/(y2-y1)=(x-x1)/(x2-x1)
@surdawi how did i do it rong?
(4- - 4)/(1- -1)= 8/2=4
so m is 4?
what you did (x2-y2)/(x1-y1)
well i thought it was -6..but its not..?
m = 4 now you choose wither point and solve for b y = 4x + b
k hold on ill try again..:)
\[m=\frac{ y2-y1 }{ x2-x1 }=\frac{ 4- -4 }{ 1- -1 }=\frac{ 8 }{ 2 }=\]
for slope slope=(y2-y1)/(x2-x1) it can be directly solve see the formula that i have given already
(y-y1)/(y2-y1)=(x-x1)/(x2-x1)
oooh!!! i got the x1and 2s switched up..ok i see..:)
|dw:1351797990809:dw|
the one with less numbers right?
there is no zeros for x or y this time so pick one and solve, it doesnt matter which one
which one would be easier?
either, same thing
k ill do the one with less numbers..:P
so 4=4x1=b? 4=b..but we already knew that..
both of them has same amount of numbers :p 4=4x1=b? ! why is there an equal to b
oooh! whoop..my bad..:)
so 4=4+4...
4=8? that dosent make sense...
4=4x1+ b what is x1 = ?
-1
y1 =?
-1
000h!!!
no it dosent..:)
-4
it should be one of the pairs either (1,4) or (-1,-4) -4 = 4*(-1) + b
-4=4x-1=4?
4*-1=?
-4
-4 = -4 + b how can you keep b on one side?
by adding 4 to b?
ok show me how?
-4=-4+b (then the 4 crosses out) +4 +4
-4 +4 = -4 + 4 +b 0 = b y = 4x + 0
where did the other set of -4=4 come from?
you have to add 4 to both sides
passes through points (–1, –4) and (1, 4)?
Anamaria what grade you in?
10.:)
you should know how to add :P
lol i do know how to add:)
-4=-4+b (then the 4 crosses out) +4 +4 was this rong?
lol @surdawi u sleeping?
i went to pray |dw:1351801108941:dw|
lol were u praying that id understand how to do this? lol jk ook umm anyway i thought b=4?
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
4 is not 8...? im so confused!!
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??
do you want me to give you problem to do?
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)
noo i dont want another problem im too stuck with this one..:)
tell what you dont understand |dw:1351802673845:dw|
i dont really understand what you did..like at all... for the one on the right side...
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
ok so b = 4 and 0?
no only 0 how do you get the 4?
what we did earlier..
we never got b = 4 we got m is 4
oooh!!!
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
k thanks 4 ur help:)

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