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25 January, 09:22

3x + y = 17

4x - y = 18

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Answers (2)
  1. 25 January, 11:05
    0
    The two equations given are

    3x + y = 17 and 4x - y = 18

    Now we will first take one equation

    3x + y = 17

    Then

    y = 17 - 3x

    Now replacing the value of y in the second equation we get

    4x - y = 18

    4x - (17 - 3x) = 18

    4x + 3x - 17 = 18

    7x = 35

    x = 35/7

    = 5

    Putting the value of x in the first equation we get

    3x + y = 17

    (3 * 5) + y = 17

    15 + y = 17

    y = 17 - 15

    y = 2

    So the value of x is 5 and y is 2
  2. 25 January, 12:42
    0
    3x+y=17

    subtract 3x on both sides

    y=17-3x

    substitute 17-3x for y in the second equation

    4x - (17-3x) = 18

    7x-17=18

    7x=35

    x=5

    and now that you know x=5 you can plug that in to either of the original equations

    3 (5) + y=17

    15+y=17

    subtract 15 from both sides

    y=2
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