Write two ordered pairs (, ) corresponding to the information given in the problem.
 Find the rate of change (the slope).
 State the units in which slope is measured (-units per -unit).
 Describe what the slope means in this situation.
 Write a linear equation ( = + ) relating and . (This is easiest to do using point-slope
form.)
a)Audrey can drive 147 miles on 6 gallons of gas and 196 miles on 8 gallons of gas. Let = miles driven and = gallons of gas used.
b)The population of fish in a lake is steadily declining. In 2000, there were 12,000 fish in the lake,
but in 2020, there were 5,000 fish in the lake. Let = the number of years since 2000 and =
the number of fish in the lake.
c) At a particular community college, it costs $915 to enroll in 6 credits of classes and $1755 to
enroll in 12 credits of classes. Let = credits taken and = cost in dollars.