Dual y-axis in chart
These can both be (rather) easily accomplished in Excel.
The first example is a basic combo chart (clustered column and line with markers), then formatted to taste.
The second example is two charts (as noted by Emily). Use Page Layout>Align>Snap to Grid to align the Chart and Plot Areas so the Axis are nicely aligned. Change the Border to No Line for a seamless experience (I only have it turned on to show the relative borders).
