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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