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26 August, 20:58

X^2 + y^2 = 8

X-y=0

Select all of the following that are solutions to the system shown

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  1. 26 August, 21:04
    0
    X^2 + y^2 = 8

    X-y=0 so x = y

    replace x = y into X^2 + y^2 = 8

    y^2 + y^2 = 8

    2y^2 = 8

    y^2 = 8/2

    y^2 = 4

    y = - 2 and y = 2

    because x = y

    so x = - 2 and x = 2

    solutions:

    x = - 2 and x = + 2

    y = - 2 and y = + 2
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