(pls help) algebra

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4x+y-32=1, 6x-y-4z=7, 10x+2y-6z=5 pls show me how to solve for x,y,z. Ans:xx=1.5,y=-2,z=1

  • (pls help) algebra -

    here are several ways to do this (as I'm sure your textbook will show - read it, and do web searches for alternate presentations).

    Substitution:
    (1) 4x+y-3z = 1
    (2) 6x-y-4z = 7
    (3) 10x+2y-6z = 5

    From (1) we see that y = -4x+3z+1, so plug that into (2) and (3):

    6x - (-4x+3z+1) - 3z = 7
    10x + 2(-4x+3z+1) - 6z = 5
    or
    (4) 10x -6z = 8
    (5) 2x = 3

    From (5) we see x = 3/2
    Plug that into (4) and z = 1
    Plug x and z into any of the original equations and y = -2

    Besides substitution, there's elimination, determinants, matrices, and other methods.

  • (pls help) algebra -

    Extra credit: find and fix my typo.

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