x+y=12;x=2y

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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=12;x=2y system of equations:


  • /| x+y-12 = 0| x-(2*y) = 0
  • We try to solve the equation: x+y-12 = 0
  • x+y-12 = 0 / - x-12
  • y = -(x-12)
  • y = 12-x
  • We insert the solution into one of the initial equations of our system of equations
  • We get a system of equations:
  • /| x-(2*(12-x)) = 0| y = 12-x
  • x-1*2*(12-x) = 0
  • 3*x-24 = 0
  • 3*x-24 = 0 / + 24
  • 3*x = 24 / : 3
  • x = 24/3
  • x = 8
  • We insert the solution into one of the initial equations of our system of equations
  • For y = 12-x:
  • y = 12-8
  • y = 4
  • We get a system of equations:
  • /| y = 4| x = 8

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