Comparing Methods to solving systems. x -y =-2 7x +2y =-5 Solve it by graphing method

Question

Comparing Methods to solving systems.

x -y =-2
7x +2y =-5

Solve it by graphing method

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Lệ Thu 3 years 2021-08-18T23:16:46+00:00 1 Answers 9 views 0

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  1. giabao
    0
    2021-08-18T23:18:42+00:00
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    Answer:

    x = - 1 \\ y = 1

    Step-by-step explanation:

    x - y = - 2

    x = y - 2

    7x + 2y = - 5

    7(y - 2) + 2y = - 5 \\

    7y - 14 + 2y = - 5

    9y = 14 - 5

    9y = 9

    y = \frac{9}{9} = 1

    x = y - 2 = 1 - 2 = - 1

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