y=-0.4x+90;y=x+65

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Solution for y=-0.4x+90;y=x+65 system of equations: 


  • /| y-(-0.4*x)-90 = 0| y-x-65 = 0
  • We try to solve the equation: y-(-0.4*x)-90 = 0
  • 0.4*x+y-90 = 0 // - 0.4*x-90
  • y = -(0.4*x-90)
  • y = 90-(0.4*x)
  • We insert the solution into one of the initial equations of our system of equations
  • We get a system of equations:
  • /| 90-x-(0.4*x)-65 = 0| y = 90-(0.4*x)
  • 25-1.4*x = 0 // - 25
  • -1.4*x = -25 // : -1.4
  • x = -25/(-1.4)
  • x = 17.85714286
  • We insert the solution into one of the initial equations of our system of equations
  • For y = 90-(0.4*x): 
  • y = 90-(0.4*17.85714286)
  • y = 90-7.142857144
  • y = 82.857142856
  • We get a system of equations:
  • /| y = 82.857142856| x = 17.85714286

 

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