Algebra HELP

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USE LINEAR COMBINATIONS TO SOLVE THE SYSTEM OF LINEAR EQUATIONS (please show steps)

1) -X+8Y=16 2) 4X+5Y=-2 3)4Y=15-3X
3X+4Y=36 5X-4Y=-23 2Y=3X+21

  • Algebra HELP -

    I will do one. Then, I will happily critique your thinking on others. Take the third.

    4y=15-3x
    2y=3x+21

    double the second one..

    4y=15-3x
    4y=6x+42

    subtract, then the result is ..
    0=9x-45 and solve for x.

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