anonymous
  • anonymous
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
Mathematics
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SOLVED
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schrodinger
  • schrodinger
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asnaseer
  • asnaseer
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
asnaseer
  • asnaseer
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.
asnaseer
  • asnaseer
does that make sense?

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anonymous
  • anonymous
so you eliminated 9x all together?
asnaseer
  • asnaseer
yes
anonymous
  • anonymous
ok that is what I was doing wrong thank you so much
asnaseer
  • asnaseer
yw
anonymous
  • anonymous
So if im correct there is no solution?
asnaseer
  • asnaseer
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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