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26 December, 19:07

X - y = 3

x + 3y = 9

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Answers (2)
  1. 26 December, 22:00
    0
    Solve for one of the variables in the first equation (in this case, I will solve for X):

    X = Y + 3

    Then use that value of X in the second equation to solve for Y:

    X + 3Y = 9

    (Y + 3) + 3Y = 9

    4Y + 3 = 9

    4Y = 6

    Y = 1.5

    Use the value of Y we just found in the X equation we created:

    X = Y + 3

    X = 1.5 + 3

    X = 4.5

    Therefore X = 4.5 or 9/2 and Y = 1.5 or 3/2.
  2. 26 December, 22:17
    0
    X - y = 3 is the same as x=3+y

    3+y+3y = 9

    3+4y=9

    4y=9-3

    4y=6

    y=6/4

    y=3/2

    x - (3/2) = 3

    x=3 + (3/2)

    x=6/2+3/2

    x=9/2
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