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14 January, 15:40

What are the x-coordinates of the solutions to this system of equations?. x2 + y2 = 100. y = x + 2. Select one:. a. 2 and 10. b. 10 and - 2. c. 6 and - 8. d. 6 and 8

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  1. 14 January, 16:43
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    To answer, substitute the value of y in the second equation to that of the first.

    x² + (x + 2) ² = 100

    Simplification leads to,

    x² + x² + 4x + 4 = 100

    2x² + 4x + 4 = 100

    x² + 2x - 48 = 0

    The roots of this equation are x = 6 and x = - 8. Thus, the answer is letter C.
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