5) 2x + y = 28 -3x + 7y = 26

Question

5) 2x + y = 28
-3x + 7y = 26

in progress 0
Phúc Điền 5 years 2021-07-28T03:53:31+00:00 1 Answers 5 views 0

Answers ( )

  1. dangkhoa
    0
    2021-07-28T03:55:27+00:00
    Reply

    Answer:

    x = 10.353, y = 8.706

    Step-by-step explanation:

    2x+y = 28 eqn..(1)

    –3x+7y = 26 eqn..(2)

    Transpose y in eqn(1), which is;

    2x+y = 28; y = 28–2x

    Plug in y in eqn(2)

    –3x+7(28–2x) = 26

    –3x–14x+196 = 26

    –17x = 26–196

    –17x = –176

    x = 10.353

    plug in x in any of the eqn..

    2(10.353)+y = 28

    20.706+y = 28

    y = 28–20.796

    y = 8.706

Leave an answer

Browse

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