anonymous
  • anonymous
What is the value of x in the equation 4x + 8y = 40, when y = 0.8? 4.6 8.4 10 1
Mathematics
katieb
  • katieb
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Photon336
  • Photon336
you could do this two ways you can solve for x and then plug in y, do you know how to do this?
Photon336
  • Photon336
subtract 8y from both sides to get this \[40-8y = 4x\]
Photon336
  • Photon336
divide both sides by 4 \[(40-8y)/(4) = x \] this gives you 10-2y = x

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Photon336
  • Photon336
plug in y = 0.8
Photon336
  • Photon336
10-2(8/10) = 8.4 does this make sense? @apalmer004 ?
anonymous
  • anonymous
Yes, thank you.
Photon336
  • Photon336
excellent, no problem

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