anonymous
  • anonymous
someone please solve -2-10/3 my answer is not the same as the books?
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
i think the answer is -12/3 = -4
sandra
  • sandra
if this is (-2) - 10/3 , then the first thing you want to do is get everything with the same denominator
sandra
  • sandra
so -2 *3/3 = 6/3

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sandra
  • sandra
so the problem is really -6/3 - 10/3
sandra
  • sandra
or -16/3
sandra
  • sandra
does that make sense?
anonymous
  • anonymous
yes thats what i got then you have to divide by 4. so then multiply by the reciprocal and i got -16/12 which simplifies to -4/3 right?
sandra
  • sandra
hmmm, what do you mean divide by 4?
anonymous
  • anonymous
well that was part of the equation. its x + 4z=-2 and x= 10/3
sandra
  • sandra
oh I did not see that part. so you're solving for z
anonymous
  • anonymous
yeah i didnt include it in my question but yeah solving for z
sandra
  • sandra
so right 4z = -16/3
sandra
  • sandra
so to isolate z, you divide both sides by 4
sandra
  • sandra
so z = -16/(3*4) = -16/12 = -4/3
sandra
  • sandra
also, go ahead and plug it back in to the equation
anonymous
  • anonymous
thats exactly what i had but the book said 1/3
sandra
  • sandra
since now you have both the x value, and the z value
sandra
  • sandra
put them back in and make sure the equation holds true
sandra
  • sandra
(even if you just use your calculator)
anonymous
  • anonymous
the book said -1/3
anonymous
  • anonymous
yeah ill try it
sandra
  • sandra
if you put them back in, then 10/3 + 4*(-4/3) = - 2
sandra
  • sandra
so 10/3 - 16/3 = -2
sandra
  • sandra
-6/3 = -2
sandra
  • sandra
-2 = -2
sandra
  • sandra
so you were right, back of the book was wrong :p
anonymous
  • anonymous
lol okay good cause that was really irritating me i was sitting there thinking "how am i wrong?!" ahah
sandra
  • sandra
haha yeah =) it's good you questioned it :)
anonymous
  • anonymous
thank you

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