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)

- anonymous

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- schrodinger

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- anonymous

Hello :)
u want answer or learn Modom ?

- anonymous

I can try and learn it, I'm really bad at algebra :(

- anonymous

But we can answer together :)
OK ?

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## More answers

- anonymous

Yes :D

- anonymous

To find x or y we should be find one of them first :)
Which one do u like ?
X or y ?

- anonymous

x

- anonymous

To find x we should killing Y s !!!
Its so fun :)!
To killing them y1+y2=0
OK ?!

- anonymous

ok

- anonymous

Now we have
-y and 5y .
So cant kill them :)
OK ?

- anonymous

ok lol

- anonymous

To killing them we should have -5y +5y
Means -y*5
OK ?!

- anonymous

ok :D

- anonymous

Did u understand ?:)

- anonymous

Kind off :( With the info i kind of learned im gonna say its b :/

- anonymous

Maenns yes or No ?
It was important :)

- anonymous

no

- anonymous

so we killed the y's and we have -y*5 rite

- anonymous

Ok :)
No problem :)
We can start again :)

- anonymous

@AsleyXoXo :So smart !

- anonymous

:D thank u

- 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

Now look :
First we wanted X s so we should kill the y because we cant caculate them together :)
OK?

- 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

@ittskathherine :I said to u dont give the annnnnnnssssssswer .....

- anonymous

ok

- 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

you guys are smart :/

- anonymous

@AsleyXoXo:Did u understand ittskathherine s way ?????!!!!!!

- 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

i need to go back to pre algebra, they put me in algebra, i never toke pre algebra

- 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

ok

- 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

1/5=x , 8=y rite/

- anonymous

yes

- anonymous

so what do we do with those numbers

- 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

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

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

@ittskathherine , you should let @E.ali to show his work!

- anonymous

so c would be x=3, y =-2

- anonymous

@PFEH.1999 He isn't replying though and she didn't really understand his way...

- anonymous

But yes, you are right @AsleyXoXo

- anonymous

ok,show your work,she won't understand you if i interrupt you :)

- anonymous

so we plug those numbers into 5y = x − 7

- anonymous

Yes, plug it in. Since you identified y and x, you can switch those numbers where x and y are

- anonymous

-2y = -3x

- anonymous

Not exactly, because
5y = x-7
so 5(-2) = (-3) -7

- anonymous

so then you would put -2 where Y is because that's how it is in its coordinates. same with x

- anonymous

so we plug those numbers into 5y = x − 7

- anonymous

so multiply the 2 y's and x's rite

- anonymous

We don't multiply them with y and x. we replace them with x and y

- anonymous

we end up with this so 5(-2) = (-3) -7

- anonymous

YES

- anonymous

what do we do to those numbers?

- 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

-10, -10

- anonymous

So yup! since they're equal, C., is a solution to 5y = x-7

- anonymous

Makes sense now?

- anonymous

Yes it does :D , i learned something new thanks a lot every one for helping

- anonymous

no problem

- anonymous

i got 70% on my quiz, thank u all once again <3

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