x+y=30;125x+85y=3390

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Remember to put linear equations with variables x and y.
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2x+y=8
x+3y=14

Solution for x+y=30;125x+85y=3390 system of equations: 


  • /| x+y-30 = 0| 125*x+85*y-3390 = 0
  • We try to solve the equation: x+y-30 = 0
  • x+y-30 = 0 // - x-30
  • y = -(x-30)
  • y = 30-x
  • We insert the solution into one of the initial equations of our system of equations
  • We get a system of equations:
  • /| 85*(30-x)+125*x-3390 = 0| y = 30-x
  • 85*(30-x)+125*x-3390 = 0
  • 40*x-3390+2550 = 0
  • 40*x-840 = 0
  • 40*x-840 = 0 // + 840
  • 40*x = 840 // : 40
  • x = 840/40
  • x = 21
  • We insert the solution into one of the initial equations of our system of equations
  • For y = 30-x: 
  • y = 30-21
  • y = 9
  • We get a system of equations:
  • /| y = 9| x = 21

 

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