In 1998 the u. s. hispanic high school dropout rate was 29.5% and in 2008 it had dropped to 18.3%. let d represent the u. s. hispanic high school dropout rate and y represent the years since 1990. find a linear model for the dropout rate

Since the model is linear, the function describing the U.S. Hispanic high school dropout rate (d) is given by:
d = A*y + B

Note that y represents the years counting from 1990, so 2008 will correspond to y=18, and 1998 to y=8

A is calculated through the formula:

So the dropout rate is, according to this model, diminishing 1.12% per year.
Now that we know A, we can calculate B simply by replacing the KNOWN values in the formula:

So the model states that

d=-1.12*y+38.46

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