y can be eliminated from the system of equations: 4x + 7y = 12 (3) x + y = 4 by adding the equations after multiplying the second equation b

Question

y can be eliminated from the system of equations: 4x + 7y = 12 (3) x + y = 4 by adding the equations after multiplying the second equation by: a) -4 b) 4 c) -7 d) 7 e) none of these

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Camila 1 week 2021-09-10T11:10:05+00:00 1 Answer 0

Answers ( )

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    2021-09-10T11:11:37+00:00

    Answer:

    Therefore,

    The Correct option is C) -7

    Step-by-step explanation:

    Given:

    4x+7y=12  ………..Equation ( 1 )

    3x+y=4  ………..Equation ( 2 )

    To Find:

    The Correct option for Eliminating “y”

    Solution:

    So to Eliminate “y” we need to add the equations after multiplying the second equation by ” – 7 ”  (i.e option C)  -7 )

    So Equation ( 2 ) become

    -7\times (3x+y)=-7\times 4

    Applying Distributive Property we get

    -21x-7y=-28

    Now by adding  +7y and -7y will get eliminate and we get

    -17x=-16\\\\17x=16

    Therefore,

    The Correct option is C) -7

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45:7+7-4:2-5:5*4+35:2 =? ( )