When y=37 what does x equal in the equation

y=9-7x

{y,x} = {37,-4}

Step-by-step explanation:

// Solve equation [2] for the variable  y  

  [2]    y = 37  

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

  [1]    (37) + 7x = 9

  [1]    7x = -28

// Solve equation [1] for the variable  x  

  [1]    7x = - 28  

  [1]    x = - 4  

// By now we know this much :

   y = 37

   x = -4

We are done