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15 May, 18:35

What are the solutions to the system of equations? y=2x^2-8x+5 and y=x-2

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  1. 15 May, 21:35
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    (3.5; 1.5) and (1; - 1)

    Step-by-step explanation:

    y=2x²-8x+5

    y=x-2

    x - 2 = 2x²-8x+5

    2x² - 9x + 7 = 0

    (2x - 7) (x - 1) = 0

    x1 = 7/2, and x2 = 1

    y = x-2

    x1 = 7/2 = 3.5, y1 = 7/2 - 2 = 1.5, (3.5; 1.5)

    x2 = 1, y2 = 1 - 2 = - 1 (1; - 1)

    Check:

    1) y=2x²-8x+5, (3.5; 1.5)

    1.5 = 2*3.5² - 8*3.5 + 5

    1.5≡1.5

    2) y=2x²-8x+5, (1; - 1)

    -1 = 2*1 - 8*1 + 5

    - 1 ≡ - 1
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