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23 October, 08:37

Solve using elimination

10x - 5y = - 20

-5x + 5y = - 15

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Answers (1)
  1. 23 October, 12:12
    0
    -5x + 10x + 20 = - 15

    5x + 20 = - 15

    5x = - 35

    x = - 7

    (10 x - 7) - 5y = - 20

    -70 - 5y = - 20

    -70 = - 20 + 5y

    -50 = 5y

    -10 = y

    Answer x=-7 and y=-10
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