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3 September, 02:41

X + y + z = 7

2x - y + z = 7

3x - z = 2

+1
Answers (1)
  1. 3 September, 04:04
    0
    A) X + y + z = 7

    B) 2x - y + z = 7

    C) 3x - z = 2

    C) z = 3x - 2 Substituting this into equations A) and B)

    A) X + y + 3x - 2 = 7

    B) 2x - y + 3x - 2 = 7 Adding A and B

    3x + 6x - 4 = 14

    9x = 18

    x = 2

    Since x = 2 then

    A) 2 + y + 6 - 2 = 7

    A) y = 1

    A) X + y + z = 7

    A) 2 + 1 + z = 7

    z = 4
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