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Math 8R - HELP!

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Multi-Step Equations
Systems of Equation

2x = y
4x - y = -2


please help!!!!!

  • Math 8R - HELP! -

    I would use substitution
    sub the 1st into the 2nd

    4x - y = -2
    4x - (2x) = -2
    2x = -2
    x = -1
    then back into the first
    y = 2x
    y = 2(-1) = -2

  • Math 8R - HELP! -

    thank you ....

    2x + 4y = 24
    x - 2y = -8

    my mom tried helping me but didn't understand it....

  • Math 8R - HELP! -

    For your second example I would use substitution again

    Notice that in the second equation the x variable is all by itseld, that is, it is 1x understood.
    That is the key.
    look for a variable like that and solve for it

    x - 2y = -8
    x = 2y - 8

    now sub that x value of (2y-8) into the other equation
    2(2y-8) + 4y = 24
    4y - 16 + 4y = 24
    8y = 24 + 16
    8y = 40
    y = 40/8 = 5

    now plug that into
    x = 2y-8
    x = 2(5)-8 = 2

    so x=2, y=5

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