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kropot72
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The two lines intersect at the point (-2, 1).
Tahmina
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thanks for coming
!
timo86m
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y=mx+b use that formula use it twice and make the y and x equal but vary the m and b
-2=m_1*1+b_1
-2=m_2*1+b_2 that ought to work i think.
Tahmina
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i dont understand!
timo86m
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make the y and x equal to (-2,1).
ghazi
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from a point there could be infinitely many lines can pass through
ghazi
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so it could be so just write y=mx+c and put y=1 and x=-2
Tahmina
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so :1=m(-2)+b
Tahmina
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?
ghazi
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it could be anything like y=x+3
Tahmina
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oh okay
Tahmina
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i need another equation!
tafkas77
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You need another equation?
tafkas77
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Or another explanation?
Tahmina
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i need to label line and bi have line a which is y=x+3 now i need another equation!
Tahmina
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need to label line a and b and i have line a already
Tahmina
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let me scan the paper for you so it will help u okay
tafkas77
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Wow, I was just about to ask you! :) Okay! :)
Tahmina
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sorry cofee fell on it butll make sure ill show u just give me 2 minutes okay! :)
tafkas77
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Sure! Take your time. :)
Tahmina
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i think this is it!
Tahmina
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the second questions says what is the quation of each line u drew in problem 5? explain how u wrote each equation!
tafkas77
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Hmm, just a sec, Tahmina. I must go calm my dog down (she's scared of thunder lol). But I have reviewed your question. :)
Tahmina
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okay but i need u so please hurry! i have to got to bed its kinda getting late and i have school and i need to get enough sleep! thanks!
Tahmina
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:)
Tahmina
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what happened? :(
Tahmina
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u suddenly were typing then poof ur gone oh tafkas i really need ur help please!
Tahmina
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yeah theres u go ur typing again :) yay! :)
tafkas77
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sorry about that. :/
Tahmina
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im bad at this i tried this kind athying! sorry about that!
tafkas77
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The points on your line that I would use are (-2, 1) and (0,3)
tafkas77
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ONce you plug in those values, it will create the equation that you need.
Tahmina
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but i dont have another coordinates can u show me im confused and tired :(
Tahmina
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thansk! i need line b now
Tahmina
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please!
tafkas77
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Okay, line b must be parallel. do point slope form:
y - y1 = m(x - x1)
and plug in your values:
y - (1) = 1(x - (-2))
y - 1 = x + 2
y = x +3
since your slope is one, you can have literally anything for your next line:
y = x + 5
got it?
Tahmina
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oh okay! i was gonna ask u that!
Tahmina
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sam slope but difrent y itercep tno wits coming back to me ohhh
tafkas77
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Great! So you think you got it, now?
Tahmina
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yeah! thanks! for all ur help1
tafkas77
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Awesome! You're welcome, Tahmina. You know I don't mind helping you. :) Oh, there's the dog again... :)
Tahmina
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and the lightining?
tafkas77
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Ha ha, it freaks her out. She's not a chihuahua, but she shakes like one when she hears thunder XD
Tahmina
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can u help me with another problem!?
Tahmina
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|dw:1362706517622:dw|
Tahmina
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hello?
Tahmina
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:)
tafkas77
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Let's get rid of "y." The second equation can be simplified. Divide all those terms in the second equation by 4:
2x+3y=2
(24x+4y=12)/4 --> new equation: 6x + y = 3
NEW SYSTEM:
2x+3y=2
6x + y = 3
multiply second equation by -3 to get rid of the y terms.
NEW SYSTEM:
2x+3y=2
-18x -3y = -9
____________________________________ (add the equations)
-16x = -7
x =.......
Do you understand this?
Tahmina
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so the answer is c?
Tahmina
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thanks!
Tahmina
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tgt bye ! have to pray ans take a shower see u next time!
tafkas77
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Yes! :) See you next time! :D