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anonymous

  • 4 years ago

Solve using substitution method: 9x - 7y = 8

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  1. anonymous
    • 4 years ago
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    I don't know how to do substitution.

  2. anonymous
    • 4 years ago
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    there's supposed be another equation....

  3. razor99
    • 4 years ago
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    is that algebra.

  4. razor99
    • 4 years ago
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    yeah hey where is the pther equation.

  5. anonymous
    • 4 years ago
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    oh woops 9x - 7y = 8 18x - 14y = -7

  6. Directrix
    • 4 years ago
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    9x - 7y = 8 9x = 8 + 7y x = (8 + 7y)/9 Substitute into the second equation: 18 [(8 + 7y)/9] - 14y = -7 2(8 + 7y) - 14 y = -7 16 + 14y - 14 y = -7 16 = -7 which cannot happen There is no solution to this system of equations. The graphs of the two lines are parallel and there is no common solution.

  7. Directrix
    • 4 years ago
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    See graph at the link for visual confirmation. http://www.wolframalpha.com/input/?i=%289x+-+7y+%3D+8%29+and+%2818x+-+14y+%3D+-7%29

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spraguer (Moderator)
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