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anonymous

  • 4 years ago

solve using the elimination method 9x + 11y = 86 9x – 2y = -5 please if you understand this method explain it because I do not understand how to use it

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  1. asnaseer
    • 4 years ago
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    ok - you have two equations and have two unknowns to find - x and y the process involves using one equation to eliminate one of the variables. so, from the first equation we have: 9x + 11y = 86 therefore 9x = 86 - 11y now substitute this into the second equation to get: 9x - 2y = -5 therefore 86 - 11y - 2y = -5 therefore 86 - 13y = -5

  2. asnaseer
    • 4 years ago
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    from the last equation you should be able to work out what y is. then use this value of y in any of the original equations to work out what x is.

  3. asnaseer
    • 4 years ago
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    does that make sense?

  4. anonymous
    • 4 years ago
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    so you eliminated 9x all together?

  5. asnaseer
    • 4 years ago
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    yes

  6. anonymous
    • 4 years ago
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    ok that is what I was doing wrong thank you so much

  7. asnaseer
    • 4 years ago
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    yw

  8. anonymous
    • 4 years ago
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    So if im correct there is no solution?

  9. asnaseer
    • 4 years ago
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    there is a solution. the last equation we got to was: 86 - 13y = -5 therefore 13y = 86 + 5 = 91 therefore y = 7 now use the equation 9x + 11y = 86 to work out the value for x.

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