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21 November, 20:06

10. 10x + 5y = 15

y=2x-3

Substitution method

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Answers (1)
  1. 21 November, 23:40
    0
    x = 1.5

    y = 0

    Step-by-step explanation:

    10x + 5 (2x - 3) = 15

    10x + 10x - 15 = 15

    20x - 15 = 15

    20x = 30

    x = 1.5

    y = 2 (1.5) - 3

    y = 3 - 3

    y = 0

    Check:

    10 (1.5) + 5 (0) = 15

    15 + 5 (0) = 15

    15 + 0 = 15

    15 = 15
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