Celeste wants to have her hair cut and permed and also go to lunch. she knows she will need $68. the perm costs twice as much as her haircut and she needs $5 for lunch. how much does the perm cost?

Total is 68 and the perm is 2 times as much as her haircut and her lunch is $5
so...
2h+h+5= 68 (add like terms)
3h+5 = 68    (subtract 5 from both sides)
      -5   - 5
3h = 63 (divide by 3)
h= 21
so if her haircut is 21 dollars
21*2= $42
her perm cost 42 dollars