Removing the Double Y Axis

One of my least favorite charts of all time include line charts with two y axes. Sometimes we need to compare two different variables with two different units, like the total grants awarded by an agency (dollars) compared to the number of different projects that they supported (number of projects). So how do you remove the double y axis?
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How to Sketch, Doodle, and Draw Data Visualization Drafts by Hand

Your job is to draw all the different versions of your dataset before you sit down to your computer. Draw, draw, draw. Aim for 5, 10, or 15 different types of graphs. The more you learn about data visualization, the more versions you’ll be able to draw. What would your dataset look like as a bar chart? As a stacked bar chart? A line graph? A pie chart? A tree map?
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How to Tell a Story with Data: Titles, Subtitles, Annotations, Dark/Light Contrast, and Selective Labeling

Do your viewers want to see the data presented as-is (the traditional approach to data visualization)? Or, do they want you to cut to the chase and interpret the data (the storytelling approach to data visualization)? In this article, you’ll learn how titles, subtitles, annotations, dark/light contrast, and selective labeling can help you tell a story with data.
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