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14 March, 20:01

Consider the system of equations {3x+4y=2

{2x-4y=8

Which is its solution?

+4
Answers (2)
  1. 14 March, 20:16
    0
    This is the solution to your promblem

    (

    2

    ,

    -

    1
  2. 14 March, 20:18
    0
    (

    2

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    -

    1

    )

    Explanation:

    The quickest way is to use elimination

    3

    x

    +

    4

    y

    =

    2

    +

    2

    x

    -

    4

    y

    =

    8

    -

    -

    -

    -

    -

    5

    x

    =

    10



    x

    =

    2

    Now substitute into one of the original eqns.

    3

    *

    2

    +

    4

    y

    =

    2

    6

    +

    4

    y

    =

    2

    4

    y

    =

    -

    4



    y

    =

    -

    1

    check in other eqn.

    2

    x

    -

    4

    y

    =

    8

    2

    *

    2

    -

    (

    4

    *

    -

    1

    )

    =

    4

    -

    -

    4

    =

    4

    +

    4

    =

    8



    solns

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