anonymous
  • anonymous
A student is trying to solve the system of two equations given below: Equation P: y + z = 6 Equation Q: 3y + 4z = 1 Which of these is a possible step used in eliminating the y-term? (y + z = 6) ⋅ 4 (3y + 4z = 1) ⋅ 4 (y + z = 6) ⋅ −3 (3y + 4z = 1) ⋅ 3
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
sleepyjess
  • sleepyjess
We want to be able to multiply the first equation by something that will cancel out y. So if we have 3y on one equation, do we want -3y or 3y to cancel it out?
anonymous
  • anonymous
-3y to cancle out 3y

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sleepyjess
  • sleepyjess
Yes! So to get -3y, would you multiply by -3 or 3?
anonymous
  • anonymous
3?
sleepyjess
  • sleepyjess
y*3 = 3y, we want -3y
anonymous
  • anonymous
ohh ok ,ok i got it its C
sleepyjess
  • sleepyjess
yep :)
anonymous
  • anonymous
one more ill post it now

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