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2002 AMC 10B Problem 20

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2002 AMC 10B Problem 20AMC 10 Step by Step
Name:                             Date: September 13, 2026
Algebraic Manipulation · difficulty 4 of 5 · about 5 min · position P16-20

Let aa , bb , and cc be real numbers such that a−7b+8c=4a-7b+8c=4 and 8a+4b−c=78a+4b-c=7 . Then a2−b2+c2a^2-b^2+c^2 is

  1. A)

    00

  2. B)

    11

  3. C)

    44

  4. D)

    77

  5. E)

    88

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