Question

For a period 1997-2009, the percent y of students in grade 12 who used cigarettes can be modeled by 2.1x+y=81.2, where x is the number of years after 1990.
a) Solve the equation for y to represent the percent as a function of the number of years after 1990. y=
b)Use the equation from part (a) to determin the range of percent of cigarette use for the years 2000 to 2009. ___>y>___