anonymous
  • anonymous
Select the ordered pair from the choices below that is a solution to the following system of equations: 5y = x − 7 4x − y = -10 a. (-8, 3) b. (1/5, 8) c. (-3, -2) d. (-1, -1)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
Hello :) u want answer or learn Modom ?
anonymous
  • anonymous
I can try and learn it, I'm really bad at algebra :(
anonymous
  • anonymous
But we can answer together :) OK ?

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More answers

anonymous
  • anonymous
Yes :D
anonymous
  • anonymous
To find x or y we should be find one of them first :) Which one do u like ? X or y ?
anonymous
  • anonymous
x
anonymous
  • anonymous
To find x we should killing Y s !!! Its so fun :)! To killing them y1+y2=0 OK ?!
anonymous
  • anonymous
ok
anonymous
  • anonymous
Now we have -y and 5y . So cant kill them :) OK ?
anonymous
  • anonymous
ok lol
anonymous
  • anonymous
To killing them we should have -5y +5y Means -y*5 OK ?!
anonymous
  • anonymous
ok :D
anonymous
  • anonymous
Did u understand ?:)
anonymous
  • anonymous
Kind off :( With the info i kind of learned im gonna say its b :/
anonymous
  • anonymous
Maenns yes or No ? It was important :)
anonymous
  • anonymous
no
anonymous
  • anonymous
so we killed the y's and we have -y*5 rite
anonymous
  • anonymous
Ok :) No problem :) We can start again :)
anonymous
  • anonymous
@AsleyXoXo :So smart !
anonymous
  • anonymous
:D thank u
anonymous
  • anonymous
So for each of the coordinates given, (aka a,b,c,etc) They are all in the form of (x,y). So just substitute in whatever x is given into the formula so 5y= x-7, let's try plugging in a.(-8, 3) so 5(3) b/c the form is (x,y) = (-8) -7 = 15 = -15 this is not equal. so It isn't a solution for 5y = x - 7
anonymous
  • anonymous
Now look : First we wanted X s so we should kill the y because we cant caculate them together :) OK?
anonymous
  • anonymous
You can do the same with b. and plug that into the same equation and if it doesn't work, go onto c. and d. for the solutions.
anonymous
  • anonymous
@ittskathherine :I said to u dont give the annnnnnnssssssswer .....
anonymous
  • anonymous
ok
anonymous
  • anonymous
@E.ali I was just showing her a simpler way of solving for it, I used a. as an example, so I didn't give away the whole answer.
anonymous
  • anonymous
you guys are smart :/
anonymous
  • anonymous
@AsleyXoXo:Did u understand ittskathherine s way ?????!!!!!!
anonymous
  • anonymous
I can tell you an even simpler way. You know when you graph, you get the coordinates (x,y)? That's what's here. Whatever number that's in the first blank between the parenthesis, is the x. (_,y). And whatever number that's in the second blank between the parentheses is the y. (x, _) I put blank spaces in there so that you can plug in whatever number they give you.
anonymous
  • anonymous
i need to go back to pre algebra, they put me in algebra, i never toke pre algebra
anonymous
  • anonymous
So for b. it lists, (1/5, 8) so one-fifths, eight. Which means, 1/5 is x and 8 is y. because of (x,y)
anonymous
  • anonymous
ok
anonymous
  • anonymous
and c. is (-3,-2) which means, -3 is x and -2 is y. Get it? Can you tell me which number in d. is x and which is y? So i can see if you understand.
anonymous
  • anonymous
1/5=x , 8=y rite/
anonymous
  • anonymous
yes
anonymous
  • anonymous
so what do we do with those numbers
anonymous
  • anonymous
In this case, for d. (the numbers are the exact same, so it doesn't matter which is x and which is y) But you should get the idea. The left side is x, and the right side is y. You know that formula they give you? 5y= x -7. You plug in the numbers from a. (which we already did), b.,c.,and d.
anonymous
  • anonymous
So where y is, you would plug in the y number (aka 8) and where x is, you plug in the x number, (aka 1/5)
anonymous
  • anonymous
so then you would end up with an equation like this 5 (8) = (1/5) -7. They want you to solve the equation. so 5 times 8 is 40, 1/5 - 7 is equal to 7/35 - 35/35 so 40= -28/35 But however, these are not equal so therefore it is not the solution. Try it with C. and D.
anonymous
  • anonymous
@ittskathherine , you should let @E.ali to show his work!
anonymous
  • anonymous
so c would be x=3, y =-2
anonymous
  • anonymous
@PFEH.1999 He isn't replying though and she didn't really understand his way...
anonymous
  • anonymous
But yes, you are right @AsleyXoXo
anonymous
  • anonymous
ok,show your work,she won't understand you if i interrupt you :)
anonymous
  • anonymous
so we plug those numbers into 5y = x − 7
anonymous
  • anonymous
Yes, plug it in. Since you identified y and x, you can switch those numbers where x and y are
anonymous
  • anonymous
-2y = -3x
anonymous
  • anonymous
Not exactly, because 5y = x-7 so 5(-2) = (-3) -7
anonymous
  • anonymous
so then you would put -2 where Y is because that's how it is in its coordinates. same with x
anonymous
  • anonymous
so we plug those numbers into 5y = x − 7
anonymous
  • anonymous
so multiply the 2 y's and x's rite
anonymous
  • anonymous
We don't multiply them with y and x. we replace them with x and y
anonymous
  • anonymous
we end up with this so 5(-2) = (-3) -7
anonymous
  • anonymous
YES
anonymous
  • anonymous
what do we do to those numbers?
anonymous
  • anonymous
Since 5 is multiplying y, (and we replaced y with -2, we multiply 5 with -2) and since x is subtracting 7, (and we replaced x with -3, we subtract 7 from -3.)
anonymous
  • anonymous
-10, -10
anonymous
  • anonymous
So yup! since they're equal, C., is a solution to 5y = x-7
anonymous
  • anonymous
Makes sense now?
anonymous
  • anonymous
Yes it does :D , i learned something new thanks a lot every one for helping
anonymous
  • anonymous
no problem
anonymous
  • anonymous
i got 70% on my quiz, thank u all once again <3

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