anonymous
  • anonymous
x − 7y = 20 x + 12y = −1 find the value for y
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
Hi marmar, so do you know the substitution method?
anonymous
  • anonymous
Basically we're looking to build an equation that only has one variable
anonymous
  • anonymous
\[x - 7y = 20\] becomes: \[x = 20 + 7y\]

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anonymous
  • anonymous
So can you write your second equation using this value for x?
myininaya
  • myininaya
That is one way you could multiply your first equation by -1 and then add the equations.
anonymous
  • anonymous
Good point myin - that's probably easier here huh?
myininaya
  • myininaya
Maybe they like your better.
anonymous
  • anonymous
I ALWAYS think in terms of substitution - to a fault ;)
anonymous
  • anonymous
wow two moderators on one problem!
myininaya
  • myininaya
Do you prefer substitution or elimination @ marmar? (
anonymous
  • anonymous
Ha satellite - two moderators, a resident expert, and no question asker...

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