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Linear function which represent the percentage of people
f(x) = 4.6x + 26 ........(i)
The slope form of the linear function is;
y = mx + c .......(ii)
On comparing equation (i) and (ii)
m = 4.6 which is positive
Thus, it show that the percentage of people graduating from college has increased at a rate of 4.6% per year after 1998.