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12 May, 06:15

Three times one number added to another number is 18. Twice the first number minus the other number is 12. Find the numbers

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  1. 12 May, 06:19
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    3x + y = 18

    2x - y = 12

    we must make both equations have only one variable

    we first add the equations top to bottom, and get

    5x = 30

    we then divide by 5, and get x = 6

    now we sub 6 in for x, and solve for y

    3x + y = 18 y = 18 - 3x

    y = 18 - 18

    y = 0

    the first number is 6, the second number is 0
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