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pre algebra

posted by on .

how do i solve systems?
example- y=x-2 y=4x+1

  • pre algebra - ,

    set y = y
    4x + 1 = x - 2

    you finish it.

  • pre algebra - ,

    Multiple the first equation by -1:
    -y=-x+2

    Add it from the second one to get:
    y=4x+1 +(-y=x+2)= 0=3x+3

    Subtract 3 from both sides:
    -3=3x

    Divide by 3
    x=-1

    Plug it in for one equation:
    y=(-1)-2

    y=-3

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