The number N of state and federal inmates in millions during year x, where x is greater then but equal to 2002 can be approximated by the following formula.

Question

The number N of state and federal inmates in millions during year x, where x is greater then but equal to 2002 can be approximated by the following formula. 
N=0.04x-78.48
Determine the year in which there were 1.8 million inmates.

bobpursley · Answer

1.8=.04x-78.48 add 78.48 to both sides. divide both sides by .04