Algebra

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Hi. I am having some problems with substitution method and i just can't seem to get these right. I have
1. 2x - 3y = -1 with y = x-1
2. -4x + y = 6 with -5x- y = 21 and finally,
3. -5x + y =-3 with 3x -8y = 24

  • Algebra -

    2 x - 3(x-1) = -1

    2 x - 3 x + 3 = -1

    -x = -4

    x = 4
    y = x-1 = 3
    etc

    check
    8 - 9 = -1 right

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