-4x+8y=72;2x+2y=0

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

Solution for -4x+8y=72;2x+2y=0 system of equations: 


  • /| 8*y-4*x-72 = 0| 2*x+2*y = 0
  • We try to solve the equation: 8*y-4*x-72 = 0
  • 8*y-4*x-72 = 0 // + -4*x-72
  • 8*y = -(-4*x-72) // : 8
  • y = (-(-4*x-72))/8
  • y = (72-(-4*x))/8
  • We insert the solution into one of the initial equations of our system of equations
  • We get a system of equations:
  • /| 2*((72-(-4*x))/8)+2*x = 0| y = (72-(-4*x))/8
  • (2*(4*x+72))/8+2*x = 0
  • 3*x+18 = 0
  • 3*x+18 = 0 // - 18
  • 3*x = -18 // : 3
  • x = -18/3
  • x = -6
  • We insert the solution into one of the initial equations of our system of equations
  • For y = (72-(-4*x))/8: 
  • y = (72-(-6*(-4)))/8
  • y = (72-(4*6))/8
  • y = (72-24)/8
  • y = 48/8
  • y = 6
  • We get a system of equations:
  • /| y = 6| x = -6

 

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