anonymous
  • anonymous
Solve each system of equations by substitution -3v-3x=15 5v+x=-29
Mathematics
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anonymous
  • anonymous
Solve each system of equations by substitution -3v-3x=15 5v+x=-29
Mathematics
katieb
  • katieb
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tkhunny
  • tkhunny
Divide the first by 3 and something magic may pop out.
skullpatrol
  • skullpatrol
I tried to teach you this yesterday and you refused to learn?
anonymous
  • anonymous
I did not refuse I just didn't get it

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tkhunny
  • tkhunny
Well, @overtonka, I think @skullpatrol would be delighted to see you make a better effort, today. Divide the first equation by 3 and show what you get.
anonymous
  • anonymous
-1v-1x=5
tkhunny
  • tkhunny
Super! Any suggestion what we should do next? Hint: I didn't have you divide by 3 just for fun.
anonymous
  • anonymous
solve for one of the variables?
skullpatrol
  • skullpatrol
Yes!
anonymous
  • anonymous
so 1v=5-1x?
skullpatrol
  • skullpatrol
Now what (hint: use the name of the method)
tkhunny
  • tkhunny
Since we are using substitition, that would be the things to do. Please abandon those silly-looking '1's. We don't usually write those unless we are trying to make a point.
anonymous
  • anonymous
ok so v-x=5?
tkhunny
  • tkhunny
No, why did you UNsolve? Please "solve for one of the variables".
anonymous
  • anonymous
v=5-x?
skullpatrol
  • skullpatrol
Correct.
anonymous
  • anonymous
so plug that in to the other equation?
skullpatrol
  • skullpatrol
Substitution principle: An expression maybe replaced by another expression that has the same value If $$a=b$$then b maybe substituted for a in any expression.
skullpatrol
  • skullpatrol
|dw:1362010398136:dw|
tkhunny
  • tkhunny
It's your big chance. Let's see the substitution!

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