Solve this simultaneous equation x+2y=11 x-2y=1

Question

Solve this simultaneous equation x+2y=11
x-2y=1

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Linh Đan 5 months 2021-08-27T12:13:35+00:00 2 Answers 0 views 0

Answers ( )

    0
    2021-08-27T12:15:21+00:00

    Answer:

    using elimination method multiply both equations by 2…then subtract equation 2 from 1

    0
    2021-08-27T12:15:34+00:00

    Answer:

    Equation 1,

    x + 2y = 11

    Equation 2,

    x - 2y = 11

    Take equation number 2.

    x  -  2y = 11 \\ x = 11  +  2y

    Substitute ‘x’ in Equation number 1.

    x + 2y = 11 \\ 11 + 2y + 2y = 11 \\ 11 + 4y = 11 \\ 4y = 11 - 11 \\ 4y = 0 \\ y =  \frac{0}{4}  \\ y = 0

    y = 0.

    So x,

    x = 11 - 2y \\ x = 11 - 2(0) \\ x = 11 - 0 \\ x = 11

    x = 11.

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