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5 August, 07:59

Two Times a number added to another number is 25. three time the first number minus the other number is 20. find the numbers

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Answers (2)
  1. 5 August, 08:18
    0
    Equation 1: 2x + y = 25

    -Subtract 'y' (or 1) to both sides

    2x + 1 - 1 = 25 - 1

    2x = 24

    -Divide '2' to both sides

    2x/2 = 24/2

    x = 12 (I think)

    Equation 2: 3y - x = 20

    -Add 'x' (or 1) to both sides

    3y - 1 + 1 = 20 + 1

    3y = 21

    -Divide '3' to both sides

    3y/3 = 21/3

    y = 7
  2. 5 August, 08:24
    0
    2x+y=25

    3x-y=20

    solve by adding these two equations together

    2x+3x=5x

    y-y=0

    25+20=45

    you get left with

    5x=45

    divide both sides by 5

    x=9

    then plug x=9 into one of the 1st equations to solve for y

    2 (9) + y=25

    18+y=25

    subtract

    y=7

    so your numbers are 9 and 7
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