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overtonka

  • one year ago

Solve each system of equations by substitution -3v-3x=15 5v+x=-29

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  1. tkhunny
    • one year ago
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    Divide the first by 3 and something magic may pop out.

  2. skullpatrol
    • one year ago
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    I tried to teach you this yesterday and you refused to learn?

  3. overtonka
    • one year ago
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    I did not refuse I just didn't get it

  4. tkhunny
    • one year ago
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    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.

  5. overtonka
    • one year ago
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    -1v-1x=5

  6. tkhunny
    • one year ago
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    Super! Any suggestion what we should do next? Hint: I didn't have you divide by 3 just for fun.

  7. overtonka
    • one year ago
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    solve for one of the variables?

  8. skullpatrol
    • one year ago
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    Yes!

  9. overtonka
    • one year ago
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    so 1v=5-1x?

  10. skullpatrol
    • one year ago
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    Now what (hint: use the name of the method)

  11. tkhunny
    • one year ago
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    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.

  12. overtonka
    • one year ago
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    ok so v-x=5?

  13. tkhunny
    • one year ago
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    No, why did you UNsolve? Please "solve for one of the variables".

  14. overtonka
    • one year ago
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    v=5-x?

  15. skullpatrol
    • one year ago
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    Correct.

  16. overtonka
    • one year ago
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    so plug that in to the other equation?

  17. skullpatrol
    • one year ago
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    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.

  18. skullpatrol
    • one year ago
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    |dw:1362010398136:dw|

  19. tkhunny
    • one year ago
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    It's your big chance. Let's see the substitution!

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