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MATH

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Solve system of equations algebraically.

1. 3x-3y=24 and 2x+5y=-37
2. -9x+10y=-2 and 45x-50y=11
3. -9x-3y=-3 and 18x+6y=6
4. -5x-6y=-23 and 8x+7y=29
5. 9x-7y=4 and 5x+3y=-46

  • MATH -

    I will do the last one, you do the others

    5.
    9x - 7y = 4
    multiply each term by 3 ---> 27x - 21y = 12
    5x + 3y = -46
    multiply each term by 7 ---> 35x + 21y = -322
    add these last two equations
    62x = -310
    x = -5

    sub into
    5(-5) + 3y = -46
    3y=-21
    y = -7

    x= -5, y = -7

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