Question

9 - x - (y - 10); use x = -10, and y = 10

Answer 1

Answer:

{x,y} = {-72,-63}

Step-by-step explanation:

// Solve equation [1] for the variable  x

 [1]    x = y - 9

// Plug this in for variable  x  in equation [2]

  [2]    9•(y -9) - 10y = -18

  [2]     - y = 63

// Solve equation [2] for the variable  y

  [2]    y = - 63

// By now we know this much :

   x = y-9

   y = -63

// Use the  y  value to solve for  x

   x = (-63)-9 = -72

there for you get  {x,y} = {-72,-63}

hope it helps