-6x-3y=-30 -9x-y=-24 Solve by elimination

Question

-6x-3y=-30
-9x-y=-24
Solve by elimination

in progress 0
Ben Gia 4 years 2021-07-27T02:01:48+00:00 1 Answers 7 views 0

Answers ( )

  1. Nho
    0
    2021-07-27T02:03:38+00:00
    Reply

    Answer:

    x=2. y=6

    Step-by-step explanation:

    Step (1)

    -6x-3y=-30

    -3(-9x-y=-24)

    Step (2)

    -6x-3y=-30

    27x+3y=72

    Step (3)

    -6x+27x=21x

    -30+72=42

    Step (4)

    21x=42

    divide 21 on each side

    x=2

    Plug x in one of the two equations

    to get the y

    -6(2)-3y=-30

    -12-3y=-30

    +12. +12

    -3y=-18

    divide negative 3

    y=6

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