8x-y=-7;y=-8x

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

Solution for 8x-y=-7;y=-8x system of equations: 


  • /| 8*x-y+7 = 0| y-(-8*x) = 0
  • We try to solve the equation: 8*x-y+7 = 0
  • 8*x-y+7 = 0 // - 8*x+7
  • -y = -(8*x+7) // * -1
  • y = 8*x+7
  • We insert the solution into one of the initial equations of our system of equations
  • We get a system of equations:
  • /| 8*x-(-8*x)+7 = 0| y = 8*x+7
  • 16*x+7 = 0 // - 7
  • 16*x = -7 // : 16
  • x = -7/16
  • We insert the solution into one of the initial equations of our system of equations
  • For y = 8*x+7: 
  • y = 8*(-7/16)+7
  • y = 7-7/16*8
  • y = 7-7/2
  • y = 7/2
  • We get a system of equations:
  • /| y = 7/2| x = -7/16

 

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