anonymous
  • anonymous
In order to solve the following system of equations by subtraction, which of the following could you do before subtracting the equations so that one variable will be eliminated when you add them? 4x+2y=7 3x-3y=15
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Multiply the top equation by 1/3. Multiply the top equation by 3 and the bottom equation by 4. Multiply the top equation by 15 and the bottom equation by 7. Multiply the top equation by -3 and the bottom equation by 2.
wolf1728
  • wolf1728
Or subtract the second equation from the first
anonymous
  • anonymous
i could but those are the given choices

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anonymous
  • anonymous
when i subtracted it i got x-y=-8... is that right?
wolf1728
  • wolf1728
Yes that's right but I gave you the wrong advice on how to solve it.
anonymous
  • anonymous
i tried multiplying the top by 3 and the bottom by 4...|dw:1378453540304:dw| so then solving it by subtraction would work
wolf1728
  • wolf1728
Multiply bottom equation by -4/3 so that 3x-3y=15 becomes -4x + 4y = 20
wolf1728
  • wolf1728
yes subtraction would work
anonymous
  • anonymous
mkay ty :)
wolf1728
  • wolf1728
Glad I could help out Just to be a little more helpful x = 2.8333333 and y = -2.1666666

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