Algebra 2 (again)

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Find the value of y for which the equation below is true.
|2x| |y + 7|
|x | = |7 - 3y|

3, -3, 1, or 4

  • Algebra 2 (again) -

    Multiply the second equation by 2 to get the system:
    |2x| |y + 7|
    |2x| = |14 - 6y|

    Equating the right-hand side gives us the TWO equations:
    2*(7-3*x)=(x+7)
    which can be solved for x, and x=1
    or
    2*(7-3*x)=-(x+7) which gives x=21/5.

    Make an appropriate choice of the solutions.

  • Algebra 2 (again) -

    These are matrices.
    I get y=1

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