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16 April, 04:35

7k+4l=20 and - 8k+2l=10

What is the value of k?

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Answers (1)
  1. 16 April, 05:26
    0
    7k+4l=20

    (-8k+2l=10) - 1

    8k-4l=-10

    +

    7k+4l=20

    15k+0=10

    10/15 = 2/3

    k=2/3
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