My daughter had a birthday party at the pool. the pool charges $5.00 for every kid and $8.00 for every adult. what linear equations with the number of kids as x and the number of adults as y that would model this situation if i spent a total of $80.00 at the pool

Mrs. avila is buying a wallpaper border to go on all of her kitchen walls. she wants to buy 5 extra feet of wallpaper border than she needs to be sure she has enough. she buys 55.5 feet of the border. the store owner selling the border uses the width of mrs. avila's kitchen to determine that the length of her kitchen must be 14.5 feet.