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anonymous

  • one year ago

7+5a=8a+7

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  1. anonymous
    • one year ago
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    you can do algebra, or you can think your choice

  2. anonymous
    • one year ago
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    or if you like we can solve it both ways

  3. anonymous
    • one year ago
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    well i tried it this way 5a-8a=7-7 = 3=0 but thats not it

  4. anonymous
    • one year ago
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    that is a good method, but you made one mistake

  5. anonymous
    • one year ago
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    \[5a-8a=7-7\] is a good first step, and it is also true that \(7-7=0\)

  6. anonymous
    • one year ago
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    but \(5a-8a\neq 3\)

  7. anonymous
    • one year ago
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    if you have 5 thousand dollars and spend 8 thousand dollars you do not end up owing only 3 dollars

  8. anonymous
    • one year ago
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    right

  9. anonymous
    • one year ago
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    while it is true that \(5-8=-3\) you have an \(a\) which seems to have disappeared \[5a-8a=-3a\] is better

  10. anonymous
    • one year ago
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    so you should be looking at \[-3a=0\]

  11. anonymous
    • one year ago
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    ohhhh then 3a-8a =5-5=0

  12. anonymous
    • one year ago
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    lets go slow

  13. anonymous
    • one year ago
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    there is no 5 in it it should be \[5a-8a=7-7\\ -3a=0\]

  14. anonymous
    • one year ago
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    yea

  15. anonymous
    • one year ago
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    and if \(-3a=0\) then of course \(a=0\)

  16. anonymous
    • one year ago
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    well then what do you do with the 3

  17. anonymous
    • one year ago
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    @satellite73

  18. anonymous
    • one year ago
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    ok lets think i have a number , i am not telling you what it is but if you multiply it by -3 you get zero what is my number?

  19. anonymous
    • one year ago
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    0

  20. anonymous
    • one year ago
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    done

  21. anonymous
    • one year ago
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    thanks. :)

  22. anonymous
    • one year ago
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    in other words, if \(-3a=0\) then \(a=0\) yw

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spraguer (Moderator)
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