9x-y=60;-4x-4y=-40

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

Solution for 9x-y=60;-4x-4y=-40 system of equations: 


  • /| 9*x-y-60 = 0| 40-4*x-(4*y) = 0
  • We try to solve the equation: 9*x-y-60 = 0
  • 9*x-y-60 = 0 // - 9*x-60
  • -y = -(9*x-60) // * -1
  • y = 9*x-60
  • We insert the solution into one of the initial equations of our system of equations
  • We get a system of equations:
  • /| 40-(4*(9*x-60))-4*x = 0| y = 9*x-60
  • 40-1*4*(9*x-60)-4*x = 0
  • 40-40*x+240 = 0
  • 280-40*x = 0
  • 280-40*x = 0 // - 280
  • -40*x = -280 // : -40
  • x = -280/(-40)
  • x = 7
  • We insert the solution into one of the initial equations of our system of equations
  • For y = 9*x-60: 
  • y = 7*9-60
  • y = 63-60
  • y = 3
  • We get a system of equations:
  • /| y = 3| x = 7

 

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