X+Y=8;4X-Y=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=8;4X-Y=7 system of equations: 


  • /| X+Y-8 = 0| 4*X-Y-7 = 0
  • We try to solve the equation: X+Y-8 = 0
  • X+Y-8 = 0 // - X-8
  • Y = -(X-8)
  • Y = 8-X
  • We insert the solution into one of the initial equations of our system of equations
  • We get a system of equations:
  • /| 4*X+X-8-7 = 0| Y = 8-X
  • 5*X-15 = 0 // + 15
  • 5*X = 15 // : 5
  • X = 15/5
  • X = 3
  • We insert the solution into one of the initial equations of our system of equations
  • For Y = 8-X: 
  • Y = 8-3
  • Y = 5
  • We get a system of equations:
  • /| Y = 5| X = 3

 

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