x+y=20;x-y=4

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for example:
2x+y=8
x+3y=14

Solution for x+y=20;x-y=4 system of equations:


  • /| x+y-20 = 0| x-y-4 = 0
  • We try to solve the equation: x+y-20 = 0
  • x+y-20 = 0 / - x-20
  • y = -(x-20)
  • y = 20-x
  • We insert the solution into one of the initial equations of our system of equations
  • We get a system of equations:
  • /| x+x-20-4 = 0| y = 20-x
  • 2*x-24 = 0 / + 24
  • 2*x = 24 / : 2
  • x = 24/2
  • x = 12
  • We insert the solution into one of the initial equations of our system of equations
  • For y = 20-x:
  • y = 20-12
  • y = 8
  • We get a system of equations:
  • /| y = 8| x = 12

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