anonymous
  • anonymous
What is the value of the x variable in the solution to the following system of equations? 2x + 3y = 1 3x - 4y = 10
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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welshfella
  • welshfella
Use the elimination method : - Multiply the first equation by 4 and the second equation by -3 The terms in y will then become 12y and -12y so adding the 2 equations eliminates y The result will be an equation in x
welshfella
  • welshfella
- which you solve for x.
anonymous
  • anonymous
can you do this with every single substitution problem?

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welshfella
  • welshfella
This is the elimination method Both the elimination and substitution method are used to solve systems of equations - the elimination method is usually the easiest one.
anonymous
  • anonymous
after multiplying should i get 17x=43?
welshfella
  • welshfella
8x + 12y = 4 9x - 12y = 30 adding:- 17x = 35
welshfella
  • welshfella
I made an error in my first post - the second equation is multiplied by 3 not -3
anonymous
  • anonymous
34?
welshfella
  • welshfella
sorry 34
anonymous
  • anonymous
thanks alot
anonymous
  • anonymous
i have alot more questions would you mind answering
welshfella
  • welshfella
yw - i dont know ehat wrong with me this morning - i keep on doing typos!!
welshfella
  • welshfella
I have about 10 minutes so i can help with some
anonymous
  • anonymous
What is the value of the y variable in the solution to the following system of equations? 13x - 6y = 20 7x + 4y = 18
anonymous
  • anonymous
for this would you do the same and multiply line one by four and line two by 6
anonymous
  • anonymous
is the correct asnwer 1
welshfella
  • welshfella
- that would eliminate y and you need to find y
anonymous
  • anonymous
i changed my steps i multiplied by negative 7 and positive 13 and i got possitive one is that correct
welshfella
  • welshfella
- but you could do it that way - find x first - then y using substitution
anonymous
  • anonymous
ohhhh that makes sense but is the answer positive 1
welshfella
  • welshfella
lets see 91x - 42y = 140 91x + 52y = 234 add 8y = 374
welshfella
  • welshfella
not sure if thats right - dont trust myself this morning
anonymous
  • anonymous
the options were negative or positive one
welshfella
  • welshfella
oh i;ll recheck
welshfella
  • welshfella
ah - can you see my deliberate mistake ( lol 1)
welshfella
  • welshfella
since the 2 terms in x are positive you need to multiply first by 13 and the second by -7 not 7
welshfella
  • welshfella
91x - 42y = 140 -91x -52y = -234 add - 94y = -94 y = 1
welshfella
  • welshfella
hope i've helped gotta go

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