Solve the system by substitution. y = 5x y = 9x + 8

Question

Solve the system by substitution.
y = 5x
y = 9x + 8

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King 1 year 2021-09-01T20:54:29+00:00 2 Answers 6 views 0

Answers ( )

    0
    2021-09-01T20:55:35+00:00

    Answer:

    (-2,-10)

    Step-by-step explanation:

    So if y=5x and if y=9x+8 then those should be able to equal each other (substitution):

    5x=9x+8

    Subtract 5x from both sides:

    0=4x+8

    Subtract 8 from both sides:

    -8=4x

    Divide both sides by 4:

    x=-2

    If x=-2, then we can just plug it back into the first equation:

    y=5(-2)

    Simplify:

    y=-10

    0
    2021-09-01T20:56:05+00:00

    Answer:

    x = -2

    y = -10

    Step-by-step explanation:

    So if y = 5x

    Then you can put that in place of the y

    5x = 9x + 8

    Get the x’s all on one side by subtracting

    -4x = 8

    Divide both sides by -4

    x = -2

    Then insert x into the first equation, so

    y = 5(-2)

    y = -10

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