Question

Each day, a young person should sleep 7 hours plus 1/4 hour for each year that the person is under 18 years of age. Assuming the relation is linear, write the equation relating hours of sleep y and age x.

Answer 1

y = 7 + (1/4)(18-x) for x <= 18
y = 7 for x > 18

Answer 2

y=7 9/2+ 1/4 x