algebra

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Solve the linear equation using any technique you have learned. Name the technique. Check.

3x + 12 = -7x - 28
I know the answer is x = -4
and I know that substitution is the technique that is used, but I can't figure out how to set this up

  • algebra -

    3(-4) + 12 = -7(-4) - 28

    -12 + 12 = 28 - 28

    0 = 0

  • algebra -

    3x + 12 = -7x - 28
    Add 7x to both sides
    3x + 12 + 7x = -7x - 28 + 7x
    10x + 12 = -28
    Now subtract 12 from both sides
    10x + 12 - 12 = -28 - 12
    10x = -40
    now divide both terms by 10
    x = -4

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