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Use substitution to solve the linear system.

3x+4y=27
y=x-2

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Mike

  1. 3x+4(x-2)=27

    3x+4x-8=27

    7x-8=27

    7x=35

    x=5

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    Anna-Marie

  2. y=3

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    Anna-Marie

  4. thx

    Same as first one except choices i got B is this correct. If not what is it and how do you get this answer?

    3x+4y=-11
    y=-x-2

    A. (-5,1) B.(4,-6) C. (3,-5)
    D. No Solution

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    Mike

  5. the answer is C

    3x+4(-x-2)=-11

    3x-4x-8=-11

    -1x-8=-11

    -1x=-3

    x=3

    y= -(3)-2

    y=-5

    any questions?

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    Anna-Marie

  6. Ahhh i miss coulculated.

    one more i thank im geting the hang of it now tho.

    y=x-2
    y=2x

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    Mike

  8. set it up like this

    x-2=2x

    then x=-2

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    Anna-Marie

  9. does y=0

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    Mike

  10. No , y is not zero. It is twice x

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    drwls

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