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algebra

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What is the solution of the system?
Solve the system of equations using the substitution method.
x-y=-1
5x+4y=-23

  • algebra -

    Eqn (1) to be mly by 4,
    then we have 4x-4y=-4,
    (2)5x+4y=-23
    ----------
    9x+ 0=-27
    9x=-27
    x=-27/9=-3
    x=-3.
    to get y,
    we substitute in the eqn(1)
    (x-y=-1) as -3-y=-1
    -3+1=y
    y=-2.

    Therefore, we get x=-3
    y=-2

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