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12 December, 06:41

If x+y = 12 and x+y+z=17 and z=8 what does y equal

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  1. 12 December, 06:44
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    x+y = 12 and x+y+z=17 where z=8 solve for y = 5/8

    Step-by-step explanation:

    Solve the following system:

    {x + y = 12 | (equation 1)

    x + 9 y = 17 | (equation 2)

    Subtract equation 1 from equation 2:

    {x + y = 12 | (equation 1)

    0 x+8 y = 5 | (equation 2)

    Divide equation 2 by 8:

    {x + y = 12 | (equation 1)

    0 x+y = 5/8 | (equation 2)

    Subtract equation 2 from equation 1:

    {x+0 y = 91/8 | (equation 1)

    0 x+y = 5/8 | (equation 2)

    Collect results:

    Answer: x = 91/8, y = 5/8
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