-4x-y=7;8x+7y=11

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Solution for -4x-y=7;8x+7y=11 system of equations: 


  • /| -4*x-y-7 = 0| 8*x+7*y-11 = 0
  • We try to solve the equation: -4*x-y-7 = 0
  • -4*x-y-7 = 0 // + -4*x-7
  • -y = -(-4*x-7) // * -1
  • y = -4*x-7
  • We insert the solution into one of the initial equations of our system of equations
  • We get a system of equations:
  • /| 7*(-4*x-7)+8*x-11 = 0| y = -4*x-7
  • 7*(-4*x-7)+8*x-11 = 0
  • -20*x-49-11 = 0
  • -20*x-60 = 0
  • -20*x-60 = 0 // + 60
  • -20*x = 60 // : -20
  • x = 60/(-20)
  • x = -3
  • We insert the solution into one of the initial equations of our system of equations
  • For y = -4*x-7: 
  • y = -4*(-3)-7
  • y = 3*4-7
  • y = 12-7
  • y = 5
  • We get a system of equations:
  • /| y = 5| x = -3

 

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