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29 October, 11:40

Solve the following system of equations: 7x - y = 4 and 3x + 2y = 9

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Answers (2)
  1. 29 October, 11:48
    0
    Use substitution method

    7x - y = 4 eqn 1

    3x + 2y = 9 eqn 2

    rearrange eqn 1:

    y = 7x - 4

    sub it in eqn 2

    3x + 2 (7x-4) = 9

    solve for x:

    3x + 14x - 8 = 9

    17x = 9+8

    x = 1

    sub x=1 in eqn 1

    y = 7 (1) - 4

    y = 3

    solution is (1, 3)
  2. 29 October, 14:29
    0
    {7x-y=4 / * 2

    {3x+2y=9

    {14x-2y=8

    {3x+2y=9 (+)

    14x+3x-2y+2y=8+9

    17x=17 / : 17

    x=1

    7x-y=4

    7*1-y=4

    -y=-3

    y=3

    Solution: (1; 3)
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