Question

In 1980, median family income was about $19,000, and in 2000 it was about $40,000. Find the slope of the line passing through points (1980, 19000) and (2000,40000)
m=

Answer 1

\[slope=m=\frac{ y _{2} - y _{1}}{ x _{2} - x _{1}}\]

Answer 2

If you treat (1980, 19000) as \[(x _{1}, y _{1})\]
and (2000,40000) as \[(x _{2}, y _{2})\]