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To evaluate Joe's salary after 3, 4, and 5 years of teaching, we can use the formula you provided:
\[
s = 500y + 40,000
\]
Here, \(s\) is the total salary and \(y\) is the number of years Joe has been teaching.
Now, we can calculate the salary for each year:
1. **For \(y = 3\)** (after 3 years):
\[
s = 500(3) + 40,000 = 1500 + 40,000 = 41,500
\]
2. **For \(y = 4\)** (after 4 years):
\[
s = 500(4) + 40,000 = 2000 + 40,000 = 42,000
\]
3. **For \(y = 5\)** (after 5 years):
\[
s = 500(5) + 40,000 = 2500 + 40,000 = 42,500
\]
Thus, the points representing Joe's salary after teaching 3, 4, and 5 years would be:
- After 3 years: \((3, 41,500)\)
- After 4 years: \((4, 42,000)\)
- After 5 years: \((5, 42,500)\)
These points can be plotted on a graph, with years on the x-axis and salary on the y-axis.