adrianaclaytonn adrianaclaytonn
  • 22-02-2017
  • Mathematics
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how do i do this?? Can you please help ? :

how do i do this Can you please help class=

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Аноним Аноним
  • 22-02-2017
4. -3(b-4)=-2b
    -3b+12=-2b
    12=-2b+3b
    12=b

5. 7x+4/3=2x-1
   3(7x+4)=3(2x-1)
  21x+12=6x-3
  21x-6x=-3-12
  15x=-15
  x=-15/15
  x=-1

6. 4x+12=-2(x+3)
   4x+12=-2x-6
   4x+2x=-6-12
   6x=-18
   x=-18/6
  x=-3

7. 7-5x=10-(6x+7)
   7-5x=17-6x
   6x-5x=17-7
   x=10
  
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