NathaliaMA13
  • NathaliaMA13
Which of the following ordered pairs represents the solution to the system given below? x − 3y = 12 2x + 6y = 60 (0, −4) (12, 0) (3, 21) (21, 3)
Mathematics
jamiebookeater
  • jamiebookeater
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NotTim
  • NotTim
rearrange one of the equations to solve for y or x, and then sub it into another.
anonymous
  • anonymous
So take the first equation and make it \[-3y = -x + 12\]
anonymous
  • anonymous
Which is \[-y = \frac{ -x }{ -3} - 4\]

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anonymous
  • anonymous
i meant y not -y
anonymous
  • anonymous
y = \[1/3x -4\]
anonymous
  • anonymous
so then take that and plug it in to 2x + 6y = 60 \[2x + 6(1/3x−4) = 60\] and then simplify
NotTim
  • NotTim
Agh, don't tell them the answer.
anonymous
  • anonymous
I didn't...
NathaliaMA13
  • NathaliaMA13
@NotTim @Jackmullen10 do I use the substitution method.
NotTim
  • NotTim
Yes. Definitely. that's what he and I said.

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