The average college tuition and fees at four-year public colleges increased from $3735 in 2001 to $8312 in 2013. (See Fig. 10.) Assuming that average tuition and fees increased linearly with respect to time, find the equation that relates the average tuition and fees, y, to the number of years after 2001, x. What were the average tuition and fees in 2009?
Figure 10 College Tuition

Figure 11 College Enrollments (in millions)

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$12000 $9000 $6000 $3000 $0 2001 2013 2000 2013