Solution - Linear equations with two unknowns

System of Linear Equations entered :

   [1]    5x + 4y = 7
   [2]    10x + 8y = 14

Solve by Substitution :

// Solve equation [2] for the variable  y 
 

  [2]    8y = -10x + 14

  [2]    y = -5x/4 + 7/4

// Plug this in for variable  y  in equation [1]

   [1]    5x + 4•(-5x/4+7/4) = 7
   [1]    0 = 0 =>  Infinitely many solutions 

Infinitely many solutions