Ответ:

  1. \(6x+12=48\)
    \(6x=36\)
    \(x=6\)
  2. \(4y-9=19\)
    \(4y=28\)
    \(y=7\)
  3. \(7x-14=35\)
    \(7x=49\)
    \(x=7\)
  4. \(9y+6=60\)
    \(9y=54\)
    \(y=6\)

Ответ: x = 6; y = 7; x = 7; y = 6.