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28 December, 05:19

X+y=100 4.50+20y=822.00 solve for x and y

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Answers (2)
  1. 28 December, 05:26
    0
    If you have a scientific calculator then plug it into your matrix button ... As [1 4.50]

    [1 20]

    [100 822]
  2. 28 December, 08:29
    0
    Without a scientific calculator!

    x+y = 100 | * (-20) = > - 20x - 20y = - 2000

    4.50x+20y=822.00 (+) = >

    => - 15.50x = - 1178.00 = > x = 1178.00/15.50 = 76 = > y = 100 - 76 = > y = 24.
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