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math grade nine

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can someone please tell me if this answer is correct
p-3+2p-9=0
p+2p-3-9=0
3p-12=0+12=0
3p/3 = 12/3 p=4

  • math grade nine -

    Yes, it's correct.

    You can prove it by substituting 4 for p in the original problem.

  • math grade nine -

    Ms Sue, Can you explain how you substitute the 4 for the p. I'm not sure if I have to add 2with the 4 or do I multiply 2 with the 4.
    4-3+2( 4) -9 +0

  • math grade nine -

    Multiply 2 * 4. The expression 2p means 2 times p.


    p-3+2p-9=0

    4 - 3 + 8 - 9 = 0

    12 - 12 = 0

  • math grade nine -

    THANKS FOR ALL THE HELP!!!! :)

  • math grade nine -

    You're welcome.

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