Question

Keith is saving money for a car. He has saved the same amount each year for the past three years, and records how much he has at the end of each year in the table below.
Year
\[1\] Year
\[2\] Year
\[3\]
Total amount saved
\[\$1500\]
\[\$3000\]
\[\$4500\]
What is Keith's unit rate of change of dollars with respect to time; that is, how much does Keith save in one year?
The unit rate is
dollars per year.
Graph the proportional relationship described above, with the
\[x\]-coordinate representing years, and the
\[y\]-coordinate representing amount saved in thousands of dollars

Answer 1

Unit rate = $1500 per year.

When y is in thousands of dollars, the relationship is y = 1.5x. Plot the points (1, 1.5), (2, 3), (3, 4.5) and draw the straight line through those points and the origin (0,0).