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dayzia dayzia
  • 31-01-2017
  • Mathematics
Answered

ELIMINATION!! How do you work out 4x+7y= -80 and 3x+5y= -58

ELIMINATION!! How do you work out 4x+7y= -80 and 3x+5y= -58 class=

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BritishAce
BritishAce BritishAce
  • 31-01-2017

Oh, I love elimination <3 Would you like to eliminate x or y?

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apetrostone
apetrostone apetrostone
  • 31-01-2017

3(4x+7y=-80)
-4(3x+5y=-58)

12x+21y=-240
-12x-20y=232
the x's cancel out and you're left with
y=8
then you plug in y and get
4x+7(8)=-80
4x+28=-80
4x=-108
x=27

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