Mathematics

Question

Really need answer, don't understand what it want:
Really need answer, don't understand what it want:

1 Answer

  • Answer:

    y ≈ - 3.8

    Step-by-step explanation:

    Given the 2 equations

    5x + 2y = 21 → (1)

    - 2x + 6y = - 34 → (2)

    To eliminate the terms in x , multiply (1) by 2 and (2) by 5

    10x + 4y = 42 → (3)

    - 10x + 30y = - 170 → (4)

    Add (3) and (4) term by term

    (10x - 10x) + (4y + 30y) = (42 - 170)

    34y = - 128 ( divide both sides by 34 )

    y ≈ - 3.8 ( to the nearest tenth )

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