anonymous
  • anonymous
Solve using substitution method: 9x - 7y = 8
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
I don't know how to do substitution.
anonymous
  • anonymous
there's supposed be another equation....
razor99
  • razor99
is that algebra.

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razor99
  • razor99
yeah hey where is the pther equation.
anonymous
  • anonymous
oh woops 9x - 7y = 8 18x - 14y = -7
Directrix
  • Directrix
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.
Directrix
  • Directrix
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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