Plot and axis titles

In the previous two exercises, you saw a set of subplots that lack any axis labels and a set of subplots that used the column names as axis labels. Why are they different? By default, the subplot() command sets titleX = shareX and titleY = shareY; thus, axis labels are only displayed if shareX and/or shareY are TRUE. You can add titleX = TRUE and/or titleY = TRUE to override this behavior.

In this example, your task is to add titles to subplots. Note that plotly has already been loaded for you.

Note: When you run your solution, you will see two warning messages about ignoring observations. These messages simply indicate that plotly is ignoring missing values.