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algebra

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can someone please tell me how to solve these, thanks!
1.2(3b-4)=8b-11
2.5(r-1)=2(r-4)-6
3.2y+3=3(y+7)
4.15x-10=-9x+2

  • algebra -

    1.2(3b-4)=8b-11
    6b-8 = 8b-11
    -2b = -3
    b = 3/2

  • algebra -

    i don't get it :( at all

  • algebra -

    3. 2y+3 = 3(y+7)
    2y+3 = 3y+21
    -y = 18
    y = -18

    I have helped you on # 1 and 3, now I think you can manage doing 2 and 4.

  • algebra -

    for # 3, you can use the distributive property.

    2y+3=3(y+7)
    2y+3 = 3y+21

    subtract 2y from both sides of the equation

    3 = y+21

    now subtract 21 from both sides

    -18 =y

  • algebra -

    4. 15x -10 =-9x+2
    15x +9x = 2+10
    24x = 12
    x = 1/2

  • algebra -

    ohhh i get it thanks!

  • algebra -

    I'm really glad you do, and you're welcome;)

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