help with math problem?

1). Elizabeth simplified the expression 5x - 3(4 - x) and got 2x - 12. Did she simply the expression correctly? explain how you know

2). Are the expressions 5x + 3xy - 5x and 7xy - 4y equivalent? Explain how you know?

Thanks for answering

3 Answers

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  • 7 years ago
    Favorite Answer

    1)

    5x - 3(4 - x) =

    distribute:

    5x - 12 + 3x =

    combine like terms:

    8x - 12

    2)

    5x + 3xy - 5x = 3xy

    not equivalent to 7xy - 4y

    - .--

  • 7 years ago

    1) No

    5x-12+3x

    8x-12 does not equal 2x-12

    2) 5x+3xy-5x=3xy

    3xy does not equal 7xy-4y

  • 7 years ago

    1) 5x-12+3x which is 8x-12...so no.

    2) 5x + 3xy - 5x = 3xy....and this does not equal 7xy-4y.

    Source(s): my brain
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