Use substitution to solve the following system of equations. -10x + 2y = 20 AND y = 3x + 2 pls pls help!

Question

Use substitution to solve the
following system of equations.
-10x + 2y = 20 AND y = 3x + 2
pls pls help!

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Thu Cúc 3 years 2021-08-27T04:47:36+00:00 1 Answers 5 views 0

Answers ( )

  1. Thunguyet
    0
    2021-08-27T04:49:10+00:00
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    Answer:

    (- 4, – 10 )

    Step-by-step explanation:

    Given the 2 equations

    – 10x + 2y = 20 → (1)

    y = 3x + 2 → (2)

    Substitute y  3x + 2 into (1)

    – 10x + 2(3x + 2) = 20 ← distribute parenthesis and simplify left side

    – 10x + 6x + 4 = 20

    – 4x + 4 = 20 ( subtract 4 from both sides )

    – 4x = 16 ( divide both sides by – 4 )

    x = – 4

    Substitute x = – 4 into (2) for corresponding value of y

    y = 3(- 4) + 2 = – 12 + 2 = – 10

    solution is (- 4, – 10 )

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