alg 2 check?

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1.)solve for n:-7n-21=-63

my answer: n=3

is this correct? please explain

2.)identify the x and y int for te equation 3x-4y=12.

  • alg 2 check? -

    You'd know that n does not equal 3 by substituting it.

    - 7 * 3 - 21 = -63
    -21 - 21 = -42 (not -63)

    -7n-21=-63
    Add 21 to both sides.

    -7n - 21 + 21 = -63 + 21

    -7n = -42

    n = -42 / -7

    n = 6


    n

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