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15 January, 17:15

9x + 8y = - 18

-5x + 3y = 10

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Answers (2)
  1. 15 January, 17:25
    0
    9x + 8y = - 18 ⇒ 27x + 24y = - 54

    -5x + 3y = 10 ⇒ - 40x + 24y = 80

    67x = - 134

    67 67

    x = - 2

    27x + 24y = - 54

    27 (-2) + 25y = - 54

    -54 + 25y = - 54

    + 54 + 54

    25y = 0

    25 25

    y = 0

    (x, y) = (-2, 0)
  2. 15 January, 17:36
    0
    9x+8y=-18

    -5x+3y=10

    9x=-18-8y

    x=-2-8/9y

    -5 (-2-8/9y) + 3y=10

    10+40/9y+3y=10

    49/9y=0

    y=0, x=-2
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