Math

twice a number minus a second number is -1. twice the second number added to three times the first number is 9. find the two numbers.

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  1. first number --- x
    2nd number --- y

    2x - y = -1
    or
    y = 2x+1

    2y + 3x = 9
    2(2x+1) + 3x = 9
    4x + 2 + 3x = 9
    7x = 7
    x = 1
    then y = 3

    The first number is 1, and the second number is 3

    check:
    twice the first - second
    = 2 - 3 = -1 , check!
    twice the second added to three times the first
    2(3) + 3(1)
    = 9 , check!

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  2. qed

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