3x+2y=4 2x-3y=7 a) 2, – 1 b)2 , 1 c)1 , 2 d)- 2 , – 1

Question

3x+2y=4
2x-3y=7

a) 2, – 1
b)2 , 1
c)1 , 2
d)- 2 , – 1

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King 4 years 2021-08-13T12:50:17+00:00 1 Answers 9 views 0

Answers ( )

  1. ThanhThu
    0
    2021-08-13T12:51:43+00:00
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    Answer:

    a) 2, -1

    Step-by-step explanation:

    3x + 2y = 4

    2y = 4 – 3x

    y = 2 – 3x/2

    2x – 3y = 7

    2x – 3×(2 – 3x/2) = 7

    2x – 6 + 9x/2 = 7

    4x/2 + 9x/2 = 13

    13x/2 = 13

    13x = 26

    x = 2

    3×2 + 2y = 4

    6 + 2y = 4

    3 + y = 2

    y = -1

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