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21 November, 09:46

Solve by substitution

13x-4y=38

*-6y = - 54

+2
Answers (2)
  1. 21 November, 09:59
    0
    13x - 4y = 38 = x - 6y = - 54

    12x - 4y = 38 = - 6y = - 54

    12x = 38 = - 2y = - 54

    12x = 92 = - 2y

    12x = 46
  2. 21 November, 10:03
    0
    X-6y = - 54

    add 6y to both sides to isolate x:

    x=6y-54

    substitute (6y-54) for x into the first equation:

    13 * (6y-54) - 4y=38

    78y-702-4y=38

    74y-702=38

    74y=740

    y=10

    x=6y-54=6 (10) - 54=6

    (x, y) = (10, 6)
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