Spring98
  • Spring98
Maya solved an equation incorrectly, as shown below: Step 1: 4x = 28 Step 2: x = 28 – 4 Step 3: x = 24 Which statement best explains why Step 2 is incorrect in Maya's solution? She did not add 4 to 28. She did not multiply 28 by 4. She did not divide 28 by 4. She did not multiply 28 four times.
Mathematics
katieb
  • katieb
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Nnesha
  • Nnesha
4 times x = 28 to cancel oout 4 what would u do ? subtract add multiply or divide ?
Michele_Laino
  • Michele_Laino
Maya has to divide by 4, not subtract 4
Spring98
  • Spring98
divide 4 with what number?

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Michele_Laino
  • Michele_Laino
4 is a factor not an addend so Maya has to divide both sides of her equation by 4, like this: \[\Large \frac{{4x}}{4} = \frac{{28}}{4}\]
Spring98
  • Spring98
the x would equal 7. so 4*7=28
Michele_Laino
  • Michele_Laino
no, the value of x, is: x=28/4=... since we have: |dw:1433355383651:dw|
Spring98
  • Spring98
then what do we do?
Michele_Laino
  • Michele_Laino
as I wrote before, we have to divide both sides of our equation by 4, so we can write: \[\large \frac{{4x}}{4} = \frac{{28}}{4} \Rightarrow x = \frac{{28}}{4} \Rightarrow x = 7\]
Spring98
  • Spring98
So that shows me that step 2 is incorrect right?
Michele_Laino
  • Michele_Laino
right!
Spring98
  • Spring98
so it is she did not divide 28 by 4 right?
Michele_Laino
  • Michele_Laino
that's right!
Spring98
  • Spring98
thanks for helping @Michele_Laino
Michele_Laino
  • Michele_Laino
:)

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