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27 March, 10:44

Value of X?

7x+3x=90?

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Answers (2)
  1. 27 March, 11:41
    0
    10x=90

    X=9

    To check

    7 (9) + 3 (9)

    63+27

    =90
  2. 27 March, 12:53
    0
    7x+3x=90

    7x+x=90-3

    7x+x=87

    X^2=87-7

    X^2=80

    (Take the square root of both X^2 and 80)

    *answer = 8.94 (round off to whole number = 9)

    (Proof check yourself)
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