addition method..
Solve each system by addition. See Examples 1â?"3. See the Strategy for the Addition Method box 8. x + y = 7 x - y = 9 12. x - 2y = - 1 - x + 5y = 4 16. 3x + 5y = - 11 x - 2y = 11 22. 2x = 2 â?" y 3x + y = - 1 Solve each system by the addition method. Determine whether the equations are independent, depen