x+7y=124;x+9y=146

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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+7y=124;x+9y=146 system of equations: 


  • /| x+7*y-124 = 0| x+9*y-146 = 0
  • We try to solve the equation: x+7*y-124 = 0
  • x+7*y-124 = 0 // - x-124
  • 7*y = -(x-124) // : 7
  • y = (-(x-124))/7
  • y = (124-x)/7
  • We insert the solution into one of the initial equations of our system of equations
  • We get a system of equations:
  • /| 9*((124-x)/7)+x-146 = 0| y = (124-x)/7
  • (9*(124-x))/7+x-146 = 0
  • 1116/7-2/7*x-146 = 0
  • 94/7-2/7*x = 0
  • 94/7-2/7*x = 0 // - 94/7
  • -2/7*x = -94/7 // : -2/7
  • x = -94/7/(-2/7)
  • x = 47
  • We insert the solution into one of the initial equations of our system of equations
  • For y = (124-x)/7: 
  • y = (124-47)/7
  • y = 77/7
  • y = 11
  • We get a system of equations:
  • /| y = 11| x = 47

 

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