x+y=17;y=x+7

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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=17;y=x+7 system of equations: 


  • /| x+y-17 = 0| y-x-7 = 0
  • We try to solve the equation: x+y-17 = 0
  • x+y-17 = 0 // - x-17
  • y = -(x-17)
  • y = 17-x
  • We insert the solution into one of the initial equations of our system of equations
  • We get a system of equations:
  • /| 17-x-x-7 = 0| y = 17-x
  • 10-2*x = 0 // - 10
  • -2*x = -10 // : -2
  • x = -10/(-2)
  • x = 5
  • We insert the solution into one of the initial equations of our system of equations
  • For y = 17-x: 
  • y = 17-5
  • y = 12
  • We get a system of equations:
  • /| y = 12| x = 5

 

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