Solve the system of equations below by elimination. (Show your work) x+2y=5 2x+6y=12

Question

Solve the system of equations below by elimination.
(Show your work)
x+2y=5
2x+6y=12

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Kiệt Gia 3 years 2021-08-06T18:35:32+00:00 1 Answers 7 views 0

Answers ( )

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    2021-08-06T18:37:22+00:00

    Answer: y = 1 & x = 3

    Step 1: Multiply the first equation by -2 so that the equations cancel out the x
    -2 ( x + 2y ) = 5

    Step 2: Simplify
    -2x -4y = – 10

    Step 3: Add equations
    (-2x – 4y = -10)
    + (2x + 6y = 12)
    ————————-
    2y = 2

    Step 4: Simply by dividing both sides by 2
    y = 1

    Step 5: Substitute y into either equation & simply
    x + 2y = 5
    x + 2(1) = 5
    x+2=5
    x=3

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