Download Glencoe Algebra 1

Find Rate of Change
DRIVING TIME Use the table to find the rate of
change. Explain the meaning of the rate of change.
CELL PHONE The table shows how the cost
changes with the number of minutes used. Use
the table to find the rate of change. Explain the
meaning of the rate of change.
Variable Rate of Change
A. TRAVEL The graph to the
right shows the number of U.S.
passports issued in 2002, 2004,
and 2006. Find the rates of
change for 2002–2004 and
2004–2006.
millions of passports
years
A. Airlines The graph shows the
number of airplane departures in the
United States in recent years. Find
the rates of change for 1995–2000
and 2000–2005.
Constant Rate of Change
A. Determine whether the function is linear. Explain.
A. Determine whether the function is linear. Explain.
Positive, Negative, and Zero Slope
A. Find the slope of the line that passes through
(–3, 2) and (5, 5).
Let (–3, 2) = (x1, y1) and (5, 5) = (x2, y2).
Substitute.
Simplify.
Answer:
A. Find the slope of the line that passes through
(4, 5) and (7, 6).