anonymous
  • anonymous
please help me solve this a=x+y+z/3 a. y = a - 3x - z b. y = a - x - 3z c. y = 3a - x - z
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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FibonacciChick666
  • FibonacciChick666
If, a,x and z were numbers, could you find y?
anonymous
  • anonymous
\[\frac{ x+y+z }{ 3 } it looks like this
anonymous
  • anonymous
|dw:1432755045660:dw|

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FibonacciChick666
  • FibonacciChick666
I assumed from the answer choices that was the problem, but you still have not answered, if a,z, and x were just numbers instead of variables, could you find y?
anonymous
  • anonymous
i dont know how
FibonacciChick666
  • FibonacciChick666
ok, so can you tell me the order of operations?
anonymous
  • anonymous
i really know nothing about this thats why i need help
FibonacciChick666
  • FibonacciChick666
Well, then at least google the order of operations. You should have learned that in 5th or 6th grade.
anonymous
  • anonymous
divide is first
FibonacciChick666
  • FibonacciChick666
I would like to know the whole order, for example, people like to use PEMDAS to remember, can you tell me what each letter stands for?
anonymous
  • anonymous
parenthasis exponets multiplication division adition subtraction
FibonacciChick666
  • FibonacciChick666
alright, so it is important to remember the order of operations because when you solve for a variable, you just reverse it. So we will do SadMep
FibonacciChick666
  • FibonacciChick666
So, first we write what the question actually means \[a=\frac{(x+y+z)}{3}\] Now, we reverse the order of operations and ask ourselves, is there any subtraction?
anonymous
  • anonymous
no subtraction
anonymous
  • anonymous
there is addition
FibonacciChick666
  • FibonacciChick666
but it is inside parentheses right? So we have to wait
FibonacciChick666
  • FibonacciChick666
so now, keep going, what comes after addition when we reverse the order of ops?
anonymous
  • anonymous
divition
FibonacciChick666
  • FibonacciChick666
right, so what is the opposite of division?
anonymous
  • anonymous
multiplication
FibonacciChick666
  • FibonacciChick666
good, so if we are dividing by 3, to undo it, we need to multiply both sides by 3, can you tell me what you get?
anonymous
  • anonymous
3a=x+y+z
FibonacciChick666
  • FibonacciChick666
nice, so now, restart your reversal of the order of ops
FibonacciChick666
  • FibonacciChick666
any subtraction?
anonymous
  • anonymous
no subtraction
FibonacciChick666
  • FibonacciChick666
so what comes next?
anonymous
  • anonymous
adition
FibonacciChick666
  • FibonacciChick666
is there any?
anonymous
  • anonymous
yes x+y+z
FibonacciChick666
  • FibonacciChick666
ok, so what are we trying to get by itself?
FibonacciChick666
  • FibonacciChick666
and how do we undo addition?
anonymous
  • anonymous
do we subtracts y and z
FibonacciChick666
  • FibonacciChick666
well, we want y so we will leave it. If we subtracted y and z from bothe sides, we'd find x not y. So what do we need to subtraact from both sides?
anonymous
  • anonymous
z and x?
FibonacciChick666
  • FibonacciChick666
yea, and what do you get?
anonymous
  • anonymous
3a=y
FibonacciChick666
  • FibonacciChick666
no, remember you have to do it to both sides
anonymous
  • anonymous
-3?
FibonacciChick666
  • FibonacciChick666
nah, just write the whole thing out. you are here: \[3a=x+y+z\]
FibonacciChick666
  • FibonacciChick666
so what are you doing?

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