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15 February, 22:29

3x+y-2z=22 x+5y+z=4 x=-3z

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  1. 15 February, 22:47
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    x = 6; y = 0; z = - 2

    3x + y - 2z = 22 ⇒ 3 (6) + 0 - 2 (-2) = 22 ⇒ 18 + 4 = 22 ⇒ 22 = 22

    x + 5y + z = 4 ⇒ 6 + 5 (0) + (-2) = 4 ⇒ 6 - 2 = 4 ⇒ 4 = 4

    x = - 3z

    3 (-3z) + y - 2z = 22

    -9z + y - 2z = 22

    y - 11z = 22

    y = 22 + 11z

    x + 5y + z = 4

    -3z + 5 (22 + 11z) + z = 4

    -2z + 110 + 55z = 4

    53z = 4 - 110

    53z = - 106

    z = - 106/53

    z = - 2

    x = - 3 (z)

    x = - 3 (-2)

    x = 6

    y = 22 + 11z

    y = 22 + 11 (-2)

    y = 22 - 22

    y = 0
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