2x+y=8;y=2x

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

Solution for 2x+y=8;y=2x system of equations: 


  • /| 2*x+y-8 = 0| y-(2*x) = 0
  • We try to solve the equation: 2*x+y-8 = 0
  • 2*x+y-8 = 0 // - 2*x-8
  • y = -(2*x-8)
  • y = 8-(2*x)
  • We insert the solution into one of the initial equations of our system of equations
  • We get a system of equations:
  • /| 8-(2*x)-(2*x) = 0| y = 8-(2*x)
  • 8-4*x = 0 // - 8
  • -4*x = -8 // : -4
  • x = -8/(-4)
  • x = 2
  • We insert the solution into one of the initial equations of our system of equations
  • For y = 8-(2*x): 
  • y = 8-(2*2)
  • y = 8-4
  • y = 4
  • We get a system of equations:
  • /| y = 4| x = 2

 

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