13ziar
  • 13ziar
In solving equations how do you know weather to add or subtract. eg 6x+6y=24 -5x+6y=21
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
If the number you're trying to neutralize is positive, you subtract and if negative you add.
anonymous
  • anonymous
inverse of each operation...
13ziar
  • 13ziar
I've been taught that both equations add so you do the inverse so for that equation you would subtract the top from the bottom

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anonymous
  • anonymous
are solving solving both equation at the same time? or individually?
13ziar
  • 13ziar
at the same time
anonymous
  • anonymous
then use elimination method
13ziar
  • 13ziar
yes thats what im doing then substituting it
13ziar
  • 13ziar
what about this equation: 6x+7y=-16 2x-4y=5
anonymous
  • anonymous
ok the idea is to cancel one variable, and solve the other variable
anonymous
  • anonymous
ok what variable u want to cancel first..
anonymous
  • anonymous
choose wisely
anonymous
  • anonymous
6x+7y=-16 2x-4y=5 if you multiply the second equation by -3, ull get -6x+12y=15
13ziar
  • 13ziar
OMG i was typing and wrote and it just started to reload the page
13ziar
  • 13ziar
ok so ... basically i know how to solve them but ....
13ziar
  • 13ziar
.... i want to know that if you have this equation: 6x+7y=-16 2x-4y=5 then to eliminate/solve how do you know if you add or subtract or can you do any ?
anonymous
  • anonymous
ur always adding not substracting
13ziar
  • 13ziar
sure?
anonymous
  • anonymous
yeh
13ziar
  • 13ziar
ook thanks for helping jizakallah
13ziar
  • 13ziar
:)
anonymous
  • anonymous
:D
anonymous
  • anonymous
I think this guy explain it better than me.. here you go https://www.youtube.com/watch?v=EooANDoThys

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