anonymous
  • anonymous
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
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
y = mx + b m=(y2-y1)/(x2-x1)
anonymous
  • anonymous
@lolly wanna try
anonymous
  • anonymous
no..but i will..:)

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

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