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anonymous

  • one year ago

What is the value of the x variable in the solution to the following system of equations? 2x + 3y = 1 3x - 4y = 10

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  1. welshfella
    • one year ago
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    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

  2. welshfella
    • one year ago
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    - which you solve for x.

  3. anonymous
    • one year ago
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    can you do this with every single substitution problem?

  4. welshfella
    • one year ago
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    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.

  5. anonymous
    • one year ago
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    after multiplying should i get 17x=43?

  6. welshfella
    • one year ago
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    8x + 12y = 4 9x - 12y = 30 adding:- 17x = 35

  7. welshfella
    • one year ago
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    I made an error in my first post - the second equation is multiplied by 3 not -3

  8. anonymous
    • one year ago
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    34?

  9. welshfella
    • one year ago
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    sorry 34

  10. anonymous
    • one year ago
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    thanks alot

  11. anonymous
    • one year ago
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    i have alot more questions would you mind answering

  12. welshfella
    • one year ago
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    yw - i dont know ehat wrong with me this morning - i keep on doing typos!!

  13. welshfella
    • one year ago
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    I have about 10 minutes so i can help with some

  14. anonymous
    • one year ago
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    What is the value of the y variable in the solution to the following system of equations? 13x - 6y = 20 7x + 4y = 18

  15. anonymous
    • one year ago
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    for this would you do the same and multiply line one by four and line two by 6

  16. anonymous
    • one year ago
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    is the correct asnwer 1

  17. welshfella
    • one year ago
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    - that would eliminate y and you need to find y

  18. anonymous
    • one year ago
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    i changed my steps i multiplied by negative 7 and positive 13 and i got possitive one is that correct

  19. welshfella
    • one year ago
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    - but you could do it that way - find x first - then y using substitution

  20. anonymous
    • one year ago
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    ohhhh that makes sense but is the answer positive 1

  21. welshfella
    • one year ago
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    lets see 91x - 42y = 140 91x + 52y = 234 add 8y = 374

  22. welshfella
    • one year ago
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    not sure if thats right - dont trust myself this morning

  23. anonymous
    • one year ago
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    the options were negative or positive one

  24. welshfella
    • one year ago
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    oh i;ll recheck

  25. welshfella
    • one year ago
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    ah - can you see my deliberate mistake ( lol 1)

  26. welshfella
    • one year ago
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    since the 2 terms in x are positive you need to multiply first by 13 and the second by -7 not 7

  27. welshfella
    • one year ago
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    91x - 42y = 140 -91x -52y = -234 add - 94y = -94 y = 1

  28. welshfella
    • one year ago
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    hope i've helped gotta go

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