4x+y=9;x-y=1

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

Solution for 4x+y=9;x-y=1 system of equations: 


  • /| 4*x+y-9 = 0| x-y-1 = 0
  • We try to solve the equation: 4*x+y-9 = 0
  • 4*x+y-9 = 0 // - 4*x-9
  • y = -(4*x-9)
  • y = 9-(4*x)
  • We insert the solution into one of the initial equations of our system of equations
  • We get a system of equations:
  • /| x+4*x-9-1 = 0| y = 9-(4*x)
  • 5*x-10 = 0 // + 10
  • 5*x = 10 // : 5
  • x = 10/5
  • x = 2
  • We insert the solution into one of the initial equations of our system of equations
  • For y = 9-(4*x): 
  • y = 9-(2*4)
  • y = 9-8
  • y = 1
  • We get a system of equations:
  • /| y = 1| x = 2

 

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