72x-8y=72;y=9x+9

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2x+y=8
x+3y=14

Solution for 72x-8y=72;y=9x+9 system of equations: 


  • /| 72*x-(8*y)-72 = 0| y-(9*x)-9 = 0
  • We try to solve the equation: 72*x-(8*y)-72 = 0
  • 72*x-8*y-72 = 0 // - 72*x-72
  • -8*y = -(72*x-72) // : -8
  • y = (-(72*x-72))/(-8)
  • y = (72-(72*x))/(-8)
  • We insert the solution into one of the initial equations of our system of equations
  • We get a system of equations:
  • /| (72-(72*x))/(-8)-(9*x)-9 = 0| y = (72-(72*x))/(-8)
  • (72-72*x)/(-8)-9*x-9 = 0
  • -9-9 = 0
  • -18 = 0
  • -18 = 0
  • x belongs to the empty set
  • The system of equations does not have any solution

 

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