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28 July, 13:33

What is this

{x+y=12

0.99x+1.15y=12.52

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Answers (1)
  1. 28 July, 13:34
    0
    Let,

    x+y=12. be 1. and

    0.99x+1.15y=12.52 be 2

    multiply 1 by - 0.99

    therefore

    -0.99x-0.99y=-11.88

    no

    w let this equation be 3

    and now

    add equation 2 and 3

    0.99x-0.99x+1.15y-0.99y=12.52-11.88

    therefore 0.16y=0.64

    therefore y = 0.64/0.16

    therefore y=4

    now put y=4 in equation 1

    x+4=12

    therefore

    x=12-4

    therefore

    x=8
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