nicoledobihal nicoledobihal
  • 24-04-2019
  • Mathematics
contestada

How to solve for 3x y=23
3x-2y=8

Respuesta :

cimataneesha cimataneesha
  • 24-04-2019

Answer:

{x,y} = {6,5}

Step-by-step explanation: 3x + y = 23

      3x - 2y = 8

 

Solve by Substitution :

// Solve equation [1] for the variable  y  

 

  y = -3x + 23

// Plug this in for variable  y  in equation

     3x - 2•(-3x+23) = 8

     9x = 54

// Solve equation [2] for the variable  x  

      9x = 54  

  [    x = 6  

// By now we know this much :

   x = 6

   y = -3x+23

// Use the  x  value to solve for  y  

   y = -3(6)+23 = 5  

Solution :

{x,y} = {6,5}

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