anonymous
  • anonymous
7+5a=8a+7
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
you can do algebra, or you can think your choice
anonymous
  • anonymous
or if you like we can solve it both ways
anonymous
  • anonymous
well i tried it this way 5a-8a=7-7 = 3=0 but thats not it

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anonymous
  • anonymous
that is a good method, but you made one mistake
anonymous
  • anonymous
\[5a-8a=7-7\] is a good first step, and it is also true that \(7-7=0\)
anonymous
  • anonymous
but \(5a-8a\neq 3\)
anonymous
  • anonymous
if you have 5 thousand dollars and spend 8 thousand dollars you do not end up owing only 3 dollars
anonymous
  • anonymous
right
anonymous
  • anonymous
while it is true that \(5-8=-3\) you have an \(a\) which seems to have disappeared \[5a-8a=-3a\] is better
anonymous
  • anonymous
so you should be looking at \[-3a=0\]
anonymous
  • anonymous
ohhhh then 3a-8a =5-5=0
anonymous
  • anonymous
lets go slow
anonymous
  • anonymous
there is no 5 in it it should be \[5a-8a=7-7\\ -3a=0\]
anonymous
  • anonymous
yea
anonymous
  • anonymous
and if \(-3a=0\) then of course \(a=0\)
anonymous
  • anonymous
well then what do you do with the 3
anonymous
  • anonymous
anonymous
  • anonymous
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?
anonymous
  • anonymous
0
anonymous
  • anonymous
done
anonymous
  • anonymous
thanks. :)
anonymous
  • anonymous
in other words, if \(-3a=0\) then \(a=0\) yw

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