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4 January, 04:27

Substitution

y=2x+5

x+2y=15

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Answers (1)
  1. 4 January, 04:51
    0
    Y = 2x + 5

    x + 2y = 15

    x + 2 (2x + 5) = 15

    x + 2 (2x) + 2 (5) = 15

    x + 4x + 10 = 15

    5x + 10 = 15

    - 10 - 10

    5x = 5

    5 5

    x = 1

    y = 2 (1) + 5

    y = 2 + 5

    y = 7

    (x, y) = (1, 7)
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