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12-62.
  1. Solve the system of equations below. Homework Help ✎

  2. x + y + z = 40
    y = x – 5
    x = 2z

Use substitution to solve.

If x = 2z, then y = 2z − 5.

Now that you have expressions for both x and y in terms of z, substitute them into the first equation and solve for z.
Then solve for x and y.