Answer:
Part 1) The rate of change is
Part 2) The equation of the line into slope intercept form is 
Part 3) Tom's salary would be
in ten years
Step-by-step explanation:
Let
x ------> the number of years worked
y -----> Tom's salary amount in dollars
we have the points
A(1, 75,000) and B(4,81,000)
step 1
Find the rate of change (slope)
The slope is equal to

step 2
Find the equation of the line into slope-intercept form
we know that

where
m is the slope
b is the y-intercept
we have that

point A(1, 75,000)
substitute


The equation of the line is

step 3
What will Tom's salary be in ten years?
For x=10 years
Substitute in the linear equation
