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2 February, 20:25

How many solutions does the following system have?

2x+3y=1; - 3x-2y=-1

+4
Answers (1)
  1. 2 February, 20:47
    0
    x = 1/5, y = 1/5

    Step-by-step explanation:

    Solve the following system:

    {2 x + 3 y = 1 | (equation 1)

    -3 x - 2 y = - 1 | (equation 2)

    Swap equation 1 with equation 2:

    { - (3 x) - 2 y = - 1 | (equation 1)

    2 x + 3 y = 1 | (equation 2)

    Add 2/3 * (equation 1) to equation 2:

    { - (3 x) - 2 y = - 1 | (equation 1)

    0 x + (5 y) / 3 = 1/3 | (equation 2)

    Multiply equation 1 by - 1:

    {3 x + 2 y = 1 | (equation 1)

    0 x + (5 y) / 3 = 1/3 | (equation 2)

    Multiply equation 2 by 3:

    {3 x + 2 y = 1 | (equation 1)

    0 x+5 y = 1 | (equation 2)

    Divide equation 2 by 5:

    {3 x + 2 y = 1 | (equation 1)

    0 x+y = 1/5 | (equation 2)

    Subtract 2 * (equation 2) from equation 1:

    {3 x+0 y = 3/5 | (equation 1)

    0 x+y = 1/5 | (equation 2)

    Divide equation 1 by 3:

    {x+0 y = 1/5 | (equation 1)

    0 x+y = 1/5 | (equation 2)

    Collect results:

    Answer: {x = 1/5, y = 1/5
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