anonymous
  • anonymous
My question is solve:1/2d+4=7d-4 d=?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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triciaal
  • triciaal
|dw:1433186464283:dw|
triciaal
  • triciaal
first verify the question a or b ?
triciaal
  • triciaal
in either case the objective will be to isolate the term with the variable then divide by the coefficient of the variable.

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triciaal
  • triciaal
when you have an equation whatever you do to one side also do to the other to maintain the balance
anonymous
  • anonymous
|dw:1433184144410:dw|d is actually attached to the 2
hockeychick23
  • hockeychick23
1/2d+4=7d-4 Ok so the first step is to move all the variables to one side. So we subtract 1/2d from both sides. 1/2d-1/2d+4= 7d-1/2d-4 do you get that part?
anonymous
  • anonymous
what happens to the 8d?
hockeychick23
  • hockeychick23
there is no 8d. your problem was: 1/2d+4=7d-4
anonymous
  • anonymous
The equation is actually 1/2d+4=7/8d-4. I forgot to add the 8d when I posted the question.
hockeychick23
  • hockeychick23
oh ok no problem, so first lets make the variables numbers have the same denominator, so 1/2=4/8. so your equation will then look like this: 4/8d+4=7/8d-4. You get that so far?
anonymous
  • anonymous
yes
hockeychick23
  • hockeychick23
ok so now we want to move the variables all to the same side so we do: 4/8d-4/8d+4=7/8d-4/8d-4. you get that part?
anonymous
  • anonymous
so it would look like 4=7/8d-4/8d-4.
hockeychick23
  • hockeychick23
correct :) so now we do 7/8d-4/8d= 3/8d so now the equation is 4= 3/8d-4 then we add 4 to both sides: 4+4= 3/8d. you get that part?
anonymous
  • anonymous
yes
hockeychick23
  • hockeychick23
ok so 8= 3/8d now we multiply the entire equation by 8/3 because it is the inverse of 3/8. 8/1*8/3=3/8*8/3d Do you get that part?
triciaal
  • triciaal
I really hope you understand the importance of posting all of the original problem clearly.
anonymous
  • anonymous
triciaal, yes I do. I thought I had but then I saw that I had forgotten to put in the 8d.
anonymous
  • anonymous
hockeychick23, when I multiplied 8/1 times 8/3 I got 21 1/3
hockeychick23
  • hockeychick23
correct :) d= 21 1/3 is your final answer
anonymous
  • anonymous
thank you :)
hockeychick23
  • hockeychick23
sure :)
triciaal
  • triciaal
|dw:1433187777149:dw|
triciaal
  • triciaal
wait
anonymous
  • anonymous
where did the 3 come from?
hockeychick23
  • hockeychick23
your wrong triciaal its 64/3 which is the same thing as 21 1/3
triciaal
  • triciaal
everything fine until 8 = 3/8d
hockeychick23
  • hockeychick23
they got it right already
triciaal
  • triciaal
|dw:1433188149001:dw|
anonymous
  • anonymous
How would I get the 64/3?
triciaal
  • triciaal
if it were |dw:1433188598528:dw|
hockeychick23
  • hockeychick23
8/1*8/3 so you multiply 8*8 and 1*3 giving you 64/3
triciaal
  • triciaal
@hockeychick23 your process is correct but that is not what you had above see the difference with the location of the variable
triciaal
  • triciaal
@vchenoweth22 the process is correct isolate the terms with the variable simplify divide by the coefficient (same as multiply by the reciprocal)

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