Question 307527
If you'll recall that slope is "rise" over "run", then plot the two given points on a graph in which the horizontal axis (normally the x-axis) is the year and the vertical axis (normally the y-axis) is the price.
The slope, {{{m = (y[2]-y[1])/(x[2]-x[1])}}} but in this problem you would replace the x-values with the year and the y-values with the price.  So the slope would be:
{{{m = (2.31-1.26)/(2006-1997)}}}
{{{highlight(m = 0.117)}}}