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18 December, 21:07

10 (1+3x) = -20 and - 5x-8 (1+7x) = -8

With steps

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Answers (1)
  1. 18 December, 21:30
    0
    (1)

    10 (1+3x) = -20

    Cross multiply.

    10+30x=-20

    Isolate x on one side. So you would subtract 10 on each side. and one side will cross each other out. leaving you with,

    30x=-20-10

    Subtract 10 from - 20.

    30x=-30

    Divide each side by 30 to get x.

    30x:30=-30:30

    Therefore,

    x=-1

    (2)

    -5x-8 (1+7x) = -8

    Cross multiply - 8 (1+7x)

    -5x-8-56x=-8

    Isolate all x's on one side. So you would add 8 on each side. and one side will cross each other out. leaving you with,

    -5x-56x=-8+8

    Add 8 to - 8.

    -5x-56x=0

    Subtract - 56x from - 5x

    -61x=0

    Divide each side by - 61

    -61x:-61=0:-61

    Therefore,

    x=0
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