HELP PLS! 9th Grade Math

Svetlana's hair is 4 4 centimeters ( cm cm) long. her hair grows 1 . 5 cm 1.5cm per month. svetlana wants her hair to be less than 1 6 cm 16cm long. write an inequality to determine the number of months, m m, svetlana can allow her hair to grow so that it is less than 1 6 cm 16cm long.

X+ y = 5 ; x - y =3 solve using linear combination

Pls never taught i’m really confused and i rlly need