x+y=18;4x+y=27

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

Solution for x+y=18;4x+y=27 system of equations: 


  • /| x+y-18 = 0| 4*x+y-27 = 0
  • We try to solve the equation: x+y-18 = 0
  • x+y-18 = 0 // - x-18
  • y = -(x-18)
  • y = 18-x
  • We insert the solution into one of the initial equations of our system of equations
  • We get a system of equations:
  • /| 4*x-x-27+18 = 0| y = 18-x
  • 3*x-9 = 0 // + 9
  • 3*x = 9 // : 3
  • x = 9/3
  • x = 3
  • We insert the solution into one of the initial equations of our system of equations
  • For y = 18-x: 
  • y = 18-3
  • y = 15
  • We get a system of equations:
  • /| y = 15| x = 3

 

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