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Floot

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Solve the following equation to win 100000 WL Credits and a duelling Minigame.

3x + 4y = 5,
2x - 3y = 9

x=?
y=?

Find 'x' and 'y'

SHOW YOUR WORK! (how did you do it?)
You must reply with:
1- Your answer
2- Proof/worksheet via a photo or screenshot

First to reply with the correct answer and workings will be the winner.
 

Prxme

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Jan 4, 2018
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Looks like simultaneous equations

1)
3x + 4y = 5 (1)

2x – 3y = 9 (2)



We need (1) and (2) to have the same number of x's so we multiple (1) by 2 and (2) by 3 so they both have 6 x's

6x + 8y = 10 (1)*2

6x - 9y = 27 (2)*3

Now to get rid of the x's we take one of the equations from the other. It is easier to do (2)*3 -(1)*2

6x - 9y = 27 (2)*3

  • 6x + 8y = 10 (1)*2


-17y = 17

If we dovide this equation by -17 we get

y = -1

We can now plug this into value of y into (1) to get

3x -4 = 5

add 4 on both

3x = 9

Divide by 3

x = 3

Now to check put x and y into (2)

6 - (-3) = 9



x = 3, y = -1
 
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Prxme

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Floot

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Doesn't say we can't check other places

I didn't say that you can't check on other places, but I mentioned above:

"SHOW YOUR WORK! (how did you do it?)
You must reply with:
1- Your answer
2- Proof/worksheet via a
photo or screenshot" ...

Since this wasn't YOUR workings and as I thought that you typed the whole answer, it could mean a disqualification and the offered prize can move to another giveaway for another criteria.


You could have taken a reference and do it by yourself, but using google to find the answer, isn't smart enough but since you answered it, I'll let @Xypher do the judgement since whether you should win the prize or not

Also, This is a GCSE level question. If you have used google, it means you are not on that level or if you were, i didnlt think that you needed to use google on that.
Another eligible user could have done this eq and won this giveaway.

lol
Post automatically merged:
 

Olaves

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OH SHIT IT'S OPEN AGAIN?

3x + 4y = 5,
2x - 3y = 9

okay multiply top equation by 2 and bottom equation by 3

6x + 8y = 10
6x -9y = 27

subtract the 2 new equations from each other

17y = -17

therefore y = -1

substitute y = -1 into the top equation (right at the top)

3x + (4 x -1) = 5

3x - 4 = 5

3x = 5 + 4

3x = 9

therefore x = 3
 
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Prxme

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Jan 4, 2018
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OH SHIT IT'S OPEN AGAIN?

3x + 4y = 5,
2x - 3y = 9

okay multiply top equation by 2 and bottom equation by 3

6x + 8y = 10
6x -9y = 27

subtract the 2 new equations from each other

17y = -17

therefore y = -1

substitute y = -1 into the top equation (right at the top)

3x + (4 x -1) = 5

3x - 4 = 5

3x = 5 + 4

3x = 9

therefore x = 3
And what if i told you we have to wait on xy's reply on my post before you're can get accepted LUL.
Atm i guess you'r is invalid until xy wants to give us a reply
 
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