sbuck98
  • sbuck98
Can someone help me with substitution?
Geometry
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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sbuck98
  • sbuck98
anonymous
  • anonymous
hi :D ill give it a shot
anonymous
  • anonymous
which ones do we have to do? @sbuck98

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sbuck98
  • sbuck98
I kinda needed them all:(
sbuck98
  • sbuck98
ill repost each and award a medal amd coins
anonymous
  • anonymous
okay thats fine :D so what do you know about substitution? do you know where to start?
sbuck98
  • sbuck98
I have no idea
anonymous
  • anonymous
okay thats alright :) so ill do number 1 so just fallow along, okay?
sbuck98
  • sbuck98
ok
sbuck98
  • sbuck98
Could you help me with them all please though?
anonymous
  • anonymous
yes i will :) that was the plan all along haha
anonymous
  • anonymous
okay so we start with: 6x+2y=0 4x+y=-1 so the first step is to convert one to slope-intercept form (y=mx+b)
sbuck98
  • sbuck98
Okay
anonymous
  • anonymous
alright so chose one to convert...
sbuck98
  • sbuck98
6x=2y=0 so would it be y=6x+2=0?
anonymous
  • anonymous
close :) it would be y=-3x but you got the right idea
anonymous
  • anonymous
okay lets do the other one its simpler, so we star with: 6x+2y=0 4x+y=-1 we convert the second equation: 4x+y=-1 subtract 4x y=-4x-1 correct?
anonymous
  • anonymous
@sbuck98
sbuck98
  • sbuck98
Okay yes, sorry my laptop died.
anonymous
  • anonymous
its alright haha okay so we plug our new equation in for y into the other equation, so we get: 6x+2(-4x-1) can you simplify?
sbuck98
  • sbuck98
6x=2*(4x+1)
anonymous
  • anonymous
no you see we need to find the values of x and y so we: 6x+2(-4x-1) distribute the 2: |dw:1446510815383:dw| 6x-8x-2 combine like terms: -2x-2 add 2 to both sides: -2x=2 divide by -2: x=-1 do you follow?
sbuck98
  • sbuck98
yes
anonymous
  • anonymous
okay so now we plug that into one of the equations.... 4x+y=-1 plug in for x: 4(-1)+y=-1 -4+y=-1 add 4 to both sides: y=3 so our pair is: (-1,3)
sbuck98
  • sbuck98
Okay
sbuck98
  • sbuck98
Can you help me with the rest please?
anonymous
  • anonymous
yes so now you try the second problem, tell me your answers as you go... :) ill be right here if you need help
sbuck98
  • sbuck98
So y=2x+-8
anonymous
  • anonymous
close it would be y=-1/2x -8 nice try
anonymous
  • anonymous
so plug that in for y in the other equation
sbuck98
  • sbuck98
-1/2-2y=-8
anonymous
  • anonymous
no it would be: 3x+2(-1/2-8)=-4
sbuck98
  • sbuck98
Okay,so I solve this?
anonymous
  • anonymous
yes solve for x
sbuck98
  • sbuck98
3*8-7
anonymous
  • anonymous
3x+2(-1/2-8) distribute the 2 |dw:1446512011940:dw|
sbuck98
  • sbuck98
3x+2 1/2-8
anonymous
  • anonymous
3x-1x-16=-4 correct?
sbuck98
  • sbuck98
yes
anonymous
  • anonymous
okayy so combine like terms
sbuck98
  • sbuck98
so its 6x
anonymous
  • anonymous
no 2x-16=-4
anonymous
  • anonymous
add 16 to both sides: 2x=12 divide by 2: x=6
anonymous
  • anonymous
so now plug in x to one of the equations
sbuck98
  • sbuck98
3(6)+2y=-4
anonymous
  • anonymous
okay so now multiply
anonymous
  • anonymous
3(6)
sbuck98
  • sbuck98
18+3y=-4
anonymous
  • anonymous
subtract 18 from both sides
sbuck98
  • sbuck98
-11
anonymous
  • anonymous
18+2y=-4 subtract 18: 2y=-4-18
sbuck98
  • sbuck98
I don't get this stuff at all:,( can you please show me how to work them
anonymous
  • anonymous
okay lets finish this one then ill bring someone in, okay? :) dont worry, youll do fine
sbuck98
  • sbuck98
Can you please help me finish these questions though? I have to pass this class
anonymous
  • anonymous
so -4-18 is -14 so 2y=-14 divide by 2: y=-7 our pair is: (6,-7)
sbuck98
  • sbuck98
Thank you, Could you just explain the rest of them like you did before?
anonymous
  • anonymous
hold on ill bring in a friend to help you understand it :)
sbuck98
  • sbuck98
ok
anonymous
  • anonymous
@MyNameIsNemo I SUMMON NIGGS!!!! haha :D
sbuck98
  • sbuck98
Thank you
anonymous
  • anonymous
no problem :) @sbuck98
MyNameIsNemo
  • MyNameIsNemo
@atreyu6s3x6 woulda' been cooler if you made me seem like a pokemon.... lol now i seem like a demon, which isnt bad, demon pokemon
MyNameIsNemo
  • MyNameIsNemo
hm, okay anyways whats up
anonymous
  • anonymous
haha okay so now we're on problem 3 http://assets.openstudy.com/updates/attachments/5637fa27e4b09edab9becbb3-sbuck98-1446509118095-screenshot119.png
sbuck98
  • sbuck98
yes
MyNameIsNemo
  • MyNameIsNemo
this is subbing, which is pretty fun for me actually :)
MyNameIsNemo
  • MyNameIsNemo
I love algebra!
anonymous
  • anonymous
she wants to further understand the process to solving it, i didn't know how to explain it any other way @MyNameIsNemo lol yea i know haha :D
MyNameIsNemo
  • MyNameIsNemo
Okay, well :D so what dont you understand about it, ms. Ariel?
sbuck98
  • sbuck98
Honestly, I just don't understand the whole process bc I haven't learned any of this yet.
MyNameIsNemo
  • MyNameIsNemo
oh, is it a pre-lesson assignment?
sbuck98
  • sbuck98
yes
anonymous
  • anonymous
woah i didnt know that..... hold on @sbuck98
sbuck98
  • sbuck98
But I have a F in the class so I need to get my grade up:(
MyNameIsNemo
  • MyNameIsNemo
ohhhhhhhh so it wont even count much for your grade if it's only a pre, darlin i cant help you on a pre-assignment, I can help you once you learn it if you need help
anonymous
  • anonymous
http://www.mathportal.org/algebra/solving-system-of-linear-equations/substitution-method.php check that out, its all the steps for the process :) @sbuck98
sbuck98
  • sbuck98
Could one of you please just help step me through the problems? I'm new to this school and don't get it.
MyNameIsNemo
  • MyNameIsNemo
darlin, is it a pretest or pre-assessment?
sbuck98
  • sbuck98
assesment
sbuck98
  • sbuck98
I think, It's the one you have to take for bonus before you learn it
MyNameIsNemo
  • MyNameIsNemo
okay, but is it a pre-assessment, like before they teach it, how new are you to the school?
sbuck98
  • sbuck98
am I calling it the right thing?
sbuck98
  • sbuck98
and I started a week ago
MyNameIsNemo
  • MyNameIsNemo
how do you already have an F then .-.
sbuck98
  • sbuck98
Because I didn't know any of the daily work they assigned me last week
MyNameIsNemo
  • MyNameIsNemo
I'll help with ONE but you have to follow and take it like notes, then you need to do the rest alone
sbuck98
  • sbuck98
thanks
anonymous
  • anonymous
look its a pre assignment so they wont grade it for correct answers, they'll simply grade it for the effort, just to see if you at least tried it, dont sweat it :)
MyNameIsNemo
  • MyNameIsNemo
pick 1 question
sbuck98
  • sbuck98
3
MyNameIsNemo
  • MyNameIsNemo
okay so 5x - 4y = 14 x - 2y = -2 what do you think is your 1st step
sbuck98
  • sbuck98
y=2x+-2?
MyNameIsNemo
  • MyNameIsNemo
where did you get that? I want steps
sbuck98
  • sbuck98
y=mx+b
sbuck98
  • sbuck98
so I just filled in the #s
MyNameIsNemo
  • MyNameIsNemo
no... ?
MyNameIsNemo
  • MyNameIsNemo
okay 1 sec i'll show you
anonymous
  • anonymous
step 1: solve for x or y easiest way to remember is to convert to slope-intercept
MyNameIsNemo
  • MyNameIsNemo
.-.
MyNameIsNemo
  • MyNameIsNemo
sh, you just sit there and look pretty @atreyu6s3x6
anonymous
  • anonymous
okay :) lmao whatever, NO!! @MyNameIsNemo
sbuck98
  • sbuck98
Can someone show me how?
sbuck98
  • sbuck98
I know it's rearrangef to x-2*y-(2)
anonymous
  • anonymous
@sbucks http://www.mathportal.org/algebra/solving-system-of-linear-equations/substitution-method.php use those steps
MyNameIsNemo
  • MyNameIsNemo
I'll write out the notes/steps and the question, you need to do the rest yourself after this okay?
anonymous
  • anonymous
ill be right back
sbuck98
  • sbuck98
ok
MyNameIsNemo
  • MyNameIsNemo
Hold on give me a few
MyNameIsNemo
  • MyNameIsNemo
There
1 Attachment
sbuck98
  • sbuck98
I cant see it can u rotate the pic
MyNameIsNemo
  • MyNameIsNemo
Done
sbuck98
  • sbuck98
Can u take another picture? I cant see it
MyNameIsNemo
  • MyNameIsNemo
Better?
1 Attachment
sbuck98
  • sbuck98
the bottom half is blurry
MyNameIsNemo
  • MyNameIsNemo
You good?
sbuck98
  • sbuck98
no
MyNameIsNemo
  • MyNameIsNemo
... People have no chill... One sec
MyNameIsNemo
  • MyNameIsNemo
Theres the bottom half
1 Attachment
MyNameIsNemo
  • MyNameIsNemo
We good?

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