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24 January, 00:44

X + 3y = 7 x - 3y = 1 Solve the system of equations. A) x = 4, y = 1 B) x = 1, y = 4 C) x = - 2 3, y = 3 D) x = 3, y = - 2 3

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  1. 24 January, 01:17
    0
    X+3y=7

    x-3y=1

    add them together

    x+3y=7

    x-3y=1 +

    2x+0y=8

    2x=8

    divide 2

    x=4

    subsitute

    x+3y=7

    4+3y=7

    subtract 4

    3y=3

    divid 3

    y=1

    x=4

    y=1

    answer is A
  2. 24 January, 04:00
    0
    X + 3y = 7

    x - 3y = 1

    x + 3y = 7

    - 3y - 3y

    x = 7 - 3y

    x - 3y = 1

    7 - 3y - 3y = 1

    7 - 6y = 1

    -7 - 7

    -6y = - 6

    y = 1

    Now solve for x

    X + 3y = 7

    x + 3 = 7

    x = 4

    Now we have our values:-

    x = 4 and y = 1

    Answer: A) x = 4, y = 1
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