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12 March, 11:50

Which expression has a value of 36 when x=4 and y=7 A. 2xy B. 2x+4y C. 6y-x D. 12x-2y

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  1. 12 March, 15:13
    0
    So subsitute

    x=4y=7

    A. 2xy=2 times 4 times 7=2 times 28=56 not 36

    B. 2x+4y=2 times 4+4 times 7=8+28=36 true

    the answer is B
  2. 12 March, 15:37
    0
    The answer is b, because 2x4 is 8, 4x7 is 28 and 8+28+36
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