Which shows the result of a correct substitution for the system y=2x+3 and 3x+2y=9?

Question

Which shows the result of a correct substitution for the system y=2x+3 and 3x+2y=9?

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Kiệt Gia 5 months 2021-08-14T15:16:14+00:00 1 Answers 3 views 0

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    2021-08-14T15:17:36+00:00

    Answer:

    The result of the correct substitution gives:

    x = 3/7 and y = 27/7

    Step-by-step explanation:

    From the given information:

    y = 2x + 3  —- (1)

    3x + 2y = 9 —- (2)

    By using substitutional method

    Substitute the value of y = 2x +3 into equation (2)

    So,

    3x + 2(2x + 3) = 9

    3x + 4x + 6 = 9

    7x = 9 – 6

    7x = 3

    x = 3/7

    From equation (1), let replace the value of  x  to be 3/7

    So,

    y = 2x + 3

    y = 2(3/7) + 3

    y =  6/7 + 3

    y = 27/7

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