if 2x+4y=5 and 4x+2y=7, then what is the value of x+y​

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if 2x+4y=5 and 4x+2y=7, then what is the value of x+y​

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Nho 3 years 2021-09-02T01:33:59+00:00 1 Answers 2 views 0

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  1. minhkhang
    0
    2021-09-02T01:34:59+00:00
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    Answer: 2

    Step-by-step explanation:

    Solve the system first

    2x+4y=5

    4x+2y=7

    Multiply the top equation by -2 to you can solve using a linear combination

    -2(2x+4y)=-2(5)

    -4x-8y=-10  add to

    4x+2y=7 to get

    0x-6y=-3

    y= 1/2

    Put y back into one of the original equations and solve for x

    4x+2(1/2)=7

    4x+1=7

    4x=6

    x=3/2

    add x and y together

    1/2+3/2= 4/2= 2

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )